Users of Internet Explorer 6 can now access significant Gmail performance improvements as well as new features like colored labels, group chat, an updated contact manager, remote sign out and more.

Editions impacted:
Standard, Premier, Education, Team and Partner Editions

Languages impacted:
US English

How to access what's new:
Simply sign in to Gmail. If you don't see these new features immediately, you may still need to get the latest IE6 updates from Microsoft.

For more information:
http://googleappsupdates.blogspot.com/2008/03/gmail-codebase-update-and-new-features.html