Topic: Dungeon Runners
And as a complete opposite to Felgund's post, I've started playing Dungeon Runners. a game devoid of any RP, using an MMORPG.com key giveaway. It's great fun if you enjoyed Diablo 2, as it largely mimics Diablo's gameplay, and features a massive dungeon for people to play through (lots of phat loot too). One of the great points of the game is its humour, because it manages to be funny without necessarily detracting from the feeling of playing a hack-and-slash (An ice mountain area populated with Ice Orok Protesters, who are demonstrating to inform the kingdom about warming in the area. Also lead by an Orok named Algor). The grouping system also happens to be the best I've ever played with, and nearly any special thing like resetting your dungeon instances or finding a group to play with just takes a right click on your character name/health bar.
The game is only available by referral from a current player because it's still technically an incomplete build (only 0.49, not all quests are implemented and art for armors/weapons is still being added), but I can help anyone who wants in. It's also completely free unless you want to pay the $5.99 membership fee which gets you access to stackable health and mana potions, a bank for extra inventory in town, and access to the upper tiers of armor and weapons.