The release of Gutsy has broken the record for the most user on-line at the Ubuntu Forums.
Most users ever online was 9,724, 1 Minute Ago at 09:19 AM (MST).
And the day is still young.
Also, if you are curious. Here are some other stats from the forums
Threads: 564,688, Posts: 3,549,133, Members: 403,850
Most users ever online was 11,934, Oct 23,2007 at 01:49 PM. (MST -6)