Another related Javascript version of a XML-RPC Request Builder:
ScottAndrew.com Javascript XML-RPC Message Builder

Bookmarklets for Zapping Annoyances :: Jesse Rudderman

Some more handy bookmarklets. These are oriented at disabling some of the annoying features we run across like flash applets, popups, etc.

I have noted Tim Tabor's excellent set of IE Tools & Code in an earlier posting but it seems that Tim has created another very useful tool: IEDocMon. This tool is an IE explorer bar. which lets you explore and inspect elements, events, and interfaces in live DHTML documents. It is the equivalent of the DOM Inspector in Mozilla and a very handy addition to any web developer's toolkit

An incredibly useful set of bookmarklets are collected here.
Highlights: Zoom In, Zoom Out, Show Div's, Turn on Borders, Grayscale Page.

Sam-I-Am.com Work: Bookmarklets

Some very useful bookmarklets .. especially the Show Tables (highlights all table borders on the current page), Element Ancestry (allow you to see the ancestry of any element on the page .. very useful to build css selectors), View DOM (see the current DOM after all DHTML effects have been applied), and Echo Form (which allows you to quickly see exactly what a form is submitting to a server in its elements).

Evolt.org: document.body, doctype switching, and more : evolt.org, Code

Stuff from DanSteinman.com:
The Dynamic Duo - Cross-Browser DHTML: dynAPI library
Great crossbrowser library. Being enhanced at Sourceforge: DynAPI 2

JSPack - A JavaScript Compression and Packaging Utility
JSPack is a compressor for JavaScript files. It removes most whitespace and comments from the files as well it can combine files together for easy distribution. JSPack is released under the GNU General Public License.

• Scott Andrew's XML-RPC Message Builder
  It's an XML-RPC message builder, written in JavaScript. It takes JavaScript data objects and converts them into an XML-RPC message.
  
  There are actually two components available here. One is the message builder, the other a PHP gateway called xmlrpc-socket that forwards XML-RPC requests to remote servers over the Internet. Together they turn your browser into an XML-RPC client.
   
  
• Brent Ashley's Javascript Remote Scripting (JSRS) Library
  This is a client-side javascript library which uses Dynamic HTML elements to make hidden remote procedure calls to the server. It only works asynchronously, but is known to work on Win9x, WinNT/2000, WinXP, Unix/Linux, and Mac with IE4+, NS4.x, NS6.x, Mozilla, and Galeon. There are server-side implementations for ASP, PerlCGI, PHP, and JSP(servlet). JSRS is in production use on intranet and public sites in Canada, the US, South America, Australia, Europe, and the Middle East. JSRS is free of charge and its source is open and freely available.

Liorean's Web Coding Depot: The JavaScript Theme Switcher
The Theme Switcher is a quite simple script that analyses the stylesheets on the page, and uses the alternation system as created by W3C to know what stylesheets to use and what stylesheets to leave as-is.

The Object-Oriented Cookie Library
This cookie handler is object oriented and use regular expressions instead of complicated maneuvers of string methods.

Great bookmarklet to examine a page's style sheets

Loads of bookmarklets:

• Jesse's Bookmarklets Page
• Many bookmarklets don't work in IE6. IE6 limits bookmarklets to 508 characters, and many of my bookmarklets are in the 1000-character range. You can downgrade to IE 5.5 or use Mozilla or Opera instead.
• Bookmarklets - Browser support
• Page Weight & Speed Full details here
• Gazingus: Nice collection of bookmarklets here as well as writeups of how to make them

More DHTML stuff:

• Developer-X.com: Degradable, OOP DHTML Tabs
• WebFx: Tab Pane (WebFX)
  The rest of WebFx is chock full of great DHTML widgets as well. Definitely worth checking out.
• ScottAndrew.com: Cross-browser DHTML API Reading Room. Good overview.
• WebReference.com - Drawing Charts with JavaScript (1/7)
• Stedy.com - lots of stuff here too

Another collection of nice JS/DHTML components at YoungPup.net:

• ypXmlTree is a general-purpose expandable/collapsable tree in the style of Microsoft Windows Explorer, Apple Macintosh Finder, or the navigations of many popular websites. It is highly customizable, feature rich, and degrades gracefully in older browsers or when javascript/css is unavailable.
• ypSlideOutMenus is a small, efficient script for creating exclusive, animated, cross-platform slide-out menus similar to those found in most GUI interfaces
• ypChaser is a simple script that animates an element down the side of the page when you scroll. This can keep important information like menus or copyrights visible to your users at all times. Although it would be easy to make this type of effect incredibly annoying, I've made it less-so by using a very smooth decelerated animation algorithm.
• DOM-Drag makes it easy to program interfaces with draggable elements in DHTML.
• XSLT/ASP Plumbing Library (via Chris Faranetta) does all the dirty work (and there is alot of it!) of dealing with XML in ASP. Creating XMLDocument objects, loading them up, and killing them is taken care of for you. Just call the function and it returns the transformed XML, and even throws errors when bad things happen.
  • There are several functions exposed, but the most commonly used one is TForm( ). It accepts two variable-type parameters which specify the XML document and the XSLT document, respectively. Both parameters can either be a literal string of XML, a filename that points to an XML document, or an Object of type IXMLDOMDocument.
  • There is also a TFormEx( ) function (for passing parameters to the transformation), and a LoadDocument( ) function which can also be used to load XML Documents for purposes other than an immediate transform.

Some good stuff from Jibbering.com:

Using the XML HTTP Request object
Internet Explorer on Windows and Mozilla provide a method for client side javascript to make HTTP requests. This allows you to make HEAD requests to see when a resource was last modified, or to see if it even exists. It makes your scripting options more flexible allowing for POST requests without having the page change, and opens up the possibility of using PUT, DELETE etc.

Dynamically updating SVG based on serverside information.

Tab Control
"Tab" controls are a popular user interface that don't translate all that well to a web paradigm, other implementations are always complicated and do not degrade well in the situation where script is not supported. This example contains nothing within the page content at all other than a DIV with a classname of TAB, the script then constructs the tabs. This means that without the script the page still functions well.

comp.lang.javascript FAQ

Here's a really cool set of Javascript code by Brent Ashley:

The important thing to note here is that JSRS allows DHTML pages to communicate with a web server without having to reload the page. This latest version fixes POST suport for Mozilla. The library opens the way for a whole host of interactive web applications without the normal limitations caused by the request-and-response nature of the web. Best of all, JSRS is cross platform (at least for Mozilla, NS4+ and IE4+).