<<In January, Neowin reported that Google would begin dropping support for IE 6. Today, more evidence of that move has been made apparent as YouTube will no longer support IE 6 after March 13th. Ars Technica, whose readers must still use IE 6, has taken a screen shot... >>

http://www.neowin.net/news/youtube-will-kill-ie-6-support-on-march-13th

And with Gmail, Google Apps etc. even earlier in March.

Yup indeed! First Docs and Sites, later this year Gmail.

According to this posting
http://googleenterprise.blogspot.com/2010/01/modern-browsers-for-modern-applications.html

Docs and Sites "won’t work properly" with MSIE6.

Related:
http://ie6funeral.com/