Okay - here's my suggestions!
music videos - GMV? game music vids? Essentially music videos made with game clips/cutscenes/about games
Developer talks - post mortems, interesting technology, opinions on the future of MMOs
Developer/publisher booths - game previews, demos, handouts - possibly recruiters?
Panels - ranging the gambit from secrets of X mmo, talks comparing diff mmos, foreign mmo info, Q&A with mmo devs or "gaming allstars", etc
Dealers room- mmo specific as well as related interests- electronics, anime?, etc
Artist Alley- area where people sell their gaming related arts and crafts as well as do sketches for people, etc
oo- i like the idea of a grind contest
also broadcasted pvp tourneys