Few links that can be helpful for those working on Sharepoint optimisation:
http://www.sharepointblogs.com/marwantarek/archive/2009/03/02/guide-to-sharepoint-performance-optimization.aspx
http://andrewconnell.com/blog/archive/2008/11/15/Limiting-the-Page-Payload-with-IIS-HTTP-Compression.aspx
http://msdn.microsoft.com/en-us/library/ms690559.aspx
http://blogs.technet.com/waynemo/
Excellent tool to see what is on the wire:
http://www.fiddler2.com/fiddler2/version.asp
