mybb

http://msghelp.net/

Normally I wouldn’t include a forum in the Showcase section - most of them look too much alike and all do basically the same thing. But I thought I’d add Messenger Plus! Live Help to the list.

This site is probably one of the largest communities using MyBB. The sites stats (as of February 17, 2008) are:

Our members have made a total of 380598 posts in 40208 threads.
We currently have 73014 members registered.
The most users online at one time was 1636 on 06-24-2006 at 11:54 PM.

And there were 280 active users at that time.