Microsoft Ships Windows Vista RC1

This would explain why they've also made the release candidate of the .NET Framework 3.0 available too!

• Microsoft Pre-Release Software Microsoft .NET Framework 3.0 - Release Candidate
• Microsoft® Visual Studio® 2005 Extensions for Windows® Workflow Foundation Release Candidate 5

dotTrace Profiler

"Efficient CPU profiler for hunting down performance bottlenecks in your .NET applications" - as recommended by the Joy of Code.

IE + JavaScript Performance Recommendations - Part 1

Some useful best practices for making JavaScript work well in IE (and most likely in other browsers too)