Jagex just released RuneScape 2 early this morning. Despite the name, RS2 isn't so much a sequel as a complete rewrite of the RuneScape engine. The game now has true 3D graphics, a new combat system and lots of new features.
The new version actually looks pretty cool. However, after trying it for a while, I decided that it wasn't for me and transferred my items back to the old game. This is probably something I'll regret as Jagex has said that RuneScape Classic won't get any more updates. Oh well.
Currently playing: RuneScape