use MPEG1 and/or WMV, that seems to be the best for the members. We're doing both, one 1300kbits MPEG1 version, one 1024kbits WMV version and also another "version" of the last one chopped into 1minute clips.
Tried divx/xvid etc a few years ago but stopped doing it very quickly...... got TONS of emails from pissed off members that couldnt see the vids.... remember the guys/girls signing up aint always the brightest so keep it simple!
