Cross-browser drag-and-drop example.

IE8 Gallery for Bookmarking tools

Quoted: Find add-ons that enable you to personalize Internet Explorer instantly.

IE8 Developer Tools and console

Nice compatability summary of different event handlers in each browser.

The latest "downlevel" firebug uses the pi debugger. I'm just upgrading now...could be a good alternative for Google Chrome debugging as well as IE.

Quoted: Get Wired's take on technology business news and the Silicon Valley scene including IT, media, mobility, broadband, video, design, security, software, networking and internet startups on Wired.com

IE has a subtle bug when parsing array constants - I think they are not in conformance with the ECMA-262 spec.

You can test your browser here:

http://pages.mckoss.com/dangle.htm

Update: Object initializers are even worse! Fails to parse the JS at all.

Firebug-clone for IE (from Microsoft)

Quoted: The Microsoft Internet Explorer Developer Toolbar provides a variety of tools for quickly creating, understanding, and troubleshooting Web pages.

On a brand new machine, running IE 7.0.6000.16643, when I open a new tab, I get the "You've opened a new tab" page - but it HANGS/CRASHES IE (that page is non-responsive for about a minute!). I can't navigate to another page, or click the close button, or the close box, or anything.

Here's a trick to nuke this stupid page and just get a blank page when you open a new tab:

Run: regedit
Navigate to:
HKEY_CURRENT_USER \ Software \ Microsoft \ Internet Explorer \ TabbedBrowsing
New DWORD: ShowTabsWelcome = 0

Resart IE, and this annoying (and buggy) page is gone.