I've so far had appearances in my dreams by the following b3tans (in approximate chronological order of first appearance)

crackhousecelidhband (x3), k2k6, clendrix (x3), wanderlust, Devil In Tights, The Resident Loon, beckyjsbx (x2), warmfuzzyfeeling.

While ancrenne has never appeared in a dream, she was once referred to in a dream (my parent's cat had a proximity sensor that could sense other cats and I took it somewhere it had never been, and it sensed ancrenne and beckyjsbx's cats).
[EDIT: 1-3-09: since I wrote this post, ancrenne has made her debut appearance in my dreams]

There may have been more but I can't remember offhand.

Here's the dream with wanderlust.
And here's one of the dreams with beckyjsbx

And finally, while not involving b3tans, I once had this dream.
( mistaspakkaman and the inedible shifting caterpillars, Tue 17 Feb 2009, 19:35, Reply)