I would appreciate some informal advice from people who are more knowledgeable.
I'm working with a friend to put up a multiuser Wordpress site plus Buddypress.
The right long-term direction is Wordpress 3 + Buddypress. We've been playing the the Wordpress 3 alpha.
However, we really should get this site up in the next few weeks (i.e. April 2010). That's close to the Wordpress 3 beta timeframe ... which introduces some risks.
I'm thinking that the right thing to do is to go with Wordpress 2.9 and Buddypress, and hold off on additional subdomains in the short term. After Wordpress 3 comes out, then we can upgrade and add the subdomains.
As I read the "migration to Wordpress 3.0" thread at http://mu.wordpress.org/forums/topic/16342 , I'm thinking that there may be continuity between the Wordpress 2.9 architecture and Wordpress 3.0, but potentially a break between WPMU and Wordpress 3.
Comments are welcomed. Thanks.