http://channel9.msdn.com/shows/toolshed/ToolShed-Tooltip-19-IE-8-Developer-Tools-saves-the-day-and-time/

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: http://www.ieaddons.com
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: http://blogs.msdn.com/ie/default.aspx
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 http://code.msdn.com/toolshed for all episodes. Also, use the links on http://channel9.msdn.com/toolshed to download tools. Finally, check out some more great videos on the Developer Evangelist East site: http://channel9.msdn.com/dpeeast