0.1 = (done)
0.2 = (done)
0.3 = basic perstence (rooms, items, mobs), logging
0.4 = MEF, basic remote admin, win service, equipment, race, attribs, align
0.5 = basic combat, skills, spells, settings, economy, weather
0.6 = party, guilds, chat channels
0.7 = quests, paging, msg boards, ticketing
0.8 = intermud, player housing / in-game building, professions
0.9 = admin-events support, pets (and mounts)
1.0 = release polish
1.1 and beyond = ranged combat, multiple currencies, item durability, flight, underwater
Some more things I've though of:
Auctions
Banks
Instances? (like WoW has personalized dungeons that get created just for the group and can only be seen by the group)
Custom Color / Prompts etc.
Macros
... I'll think of more.. don't worry 