Have you looked at IE8 lately? A wealth of developer tools are now included just by pressing F12. This includes a script debugger, profiler, page alignment and Section 508 compliance. 
What is it?
Built-in web page structure analysis, debugging, and profiling
Download Site: no download required! Add-ons at:
Example Problem(s) it solves:

  • Page source analysis
  • Styles, CSS, and attribute tracing
  • JavaScript debug and profiling

Installation Notes:

Built-into IE, press F12 to start/stop IE8 Developer Tools

Usage Notes:
Pin/unpin the window (Ctrl-P), Select Element by Click (Ctrl-B). See the IE Blog for tutorials:
This is the sixth of Tool Shed Tooltips released from Episode 3 of the TV Show Russ Tool Shed presents... "It's All About The Tools" hosted by Russ Fustino and Co-Host Stan Schultes. Download code, ppt and demo script from for all episodes. Also, use the links on to download tools. Finally, check out some more great videos on the Developer Evangelist East site: