LeeTheENTP submitted a new resource: Auto Gamemode Changer - Sets a player into survival mode when he changes worlds! Read more about this resource...
This is something that already happens with multi-verse. Sorry to say it but this plugin's not really needed.
This was written back when MultiVerse didn't support this feature, and I wanted to start moving my plugins over from BukkitDev for posterity. As is in the plugin's description: