there's way too much ground to cover here so i'll send you someplace where you can get some good info
http://www.dvdhelp.com
i'm having a bastard of a time myself using Windows Media Encoder on a Pentium 2 GHZ machine and NOBODY can help me.
what do you mean webmasters can't cut your WMV files?
Hmmmmmm...... i think there are utilities to cut WMV files, not sure though.
AVI and MPEG? Seems like overkill to me. Pick one or the other.
Same thing with Real Video and Windows Media......... pick one or the other. I'd go with Windows Media.