just for fun...
http://www.livibetter.com/page/gmail-quota/gmail-quota.htm

apparently gmail reach 3000 MB at Wed, 21 May 2008 15:16:33 GMT
(estimated)

Well, this prediction is non deterministic when it is after the 1st of april... A day synonym of changes in Gmail because it is its birthday...

Gmail just reached 3000 MB Oct 12th 2007 6:25 MST. They have increased the growth rate.

Follow this link for more information: http://googlesystem.blogspot.com/2007/10/gmails-storage-increases-dramatically.html