I'm running 0.9.3964 and I'm still having issues with watching videos from a G5 smb share. It seems to work most of the time, but I have problems where Boxee stops streaming during play (rare) and can't view contents of shared drives (more often). When either of these problems occurs, I can't exit Boxee and have to force a reset (pull the power plug or menu/- on the remote).
Other then that, I'm pretty damn happy with Boxee. My AppleTV really wasn't worth $300 until I put Boxee on it!