Jim Zimmerman - ASP.NET, MVC, Ajax and ORM

Here is a great post on how to increase the speed of you javascript in IE from the IE Blog. http://blogs.msdn.com/ie/archive/2006/08/28/728654.aspx
It has some very valuable information on how to optimize your javascript. I am already changing some of my code.

Also here is a good post from Nikhil about Script Loading Tips. He has some good info on how to load scripts sooner than window.onload. It's some pretty cool stuff.
Have fun!