Just received it on email from the Google Apps team:
Google Apps will continue to support Internet Explorer 7.0 and above, Firefox 3.0 and above, Google Chrome 4.0 and above, and Safari 3.0 and above.”
The text continues explaining the drop of support for IE6 on the 1st of March 2010 in the case of Google Docs and Google Sites and “later” in 2010 for Google Mail and Google Calendar. Also users will see a warning message if they using some of the older browsers. The warning message will be displayed starting this week and will urge users to upgrade their browser.
This day should have come earlier. But finally someone is taking a side on this matter.