Once I get the server done, up and tested, I am going to be working a little bit on seeing if I can't get Buildcraft working for SMP.
The issue here is that I am almost 100% sure everyone will need the right client files, which is something we've tried to stay away from.
If this is the case, I will try to build a package... once we try it out, if the consensus is ALL POWER TO PHASERS, we'll add BC to our current server.
