I'll bite.
1) Minecraft. What? I'm addicted to Tekkit. I keep starting from scratch and building machines en masse...
2) The Binding of Isaac (like 300 runs in... CAN'T...STOP...PLAYING....!) Also addicted to watching Northernlion play this. His commentary is pretty superb (youtube content producer)
3) EverQuest. Ever since it went F2P I've been reliving the days of my youth in this old school MMORPG. It's still fantastic.
4) Youtube. Wait, that's not a game... but it is sucking up most of my free time lately. There are too many entertaining channels now-a-days... Yogscast, Jesse Cox and Totalbiscuit, Tobuscus, CaptainSparkelz, Northernlion, Yrimir etc. The list goes on. If I don't get my daily 2 hours of YT, I don't function well.
5) Deus Ex (the original) I've been trying to get into this bloody hyped up the wall game. I recognize it has a decent story and a cool futuristic techno setting, and the controls remind me of System Shock 2 (one of my favorite games) but it plays like absolute garbage, and the game flat out lies to you at times. For example, the description for the Melee skill says you can take out "most enemies in 1-2 swings" well, I'm using the most powerful weapon I've found so far and with a Master in melee weapons, even the most basic enemies take at least 6 swings. Not very fun. Why did I pick melee you ask? Well... there's not enough ammo in the game! I know it's a stealthy game, but still! The gameplay is very lacking compared to SS2 imo, and I have found that even as a kid I just couldn't get into this game. The furthest I've gotten is where your brother *spoilers* (heh this game is ancient who am I kidding?) is in his hotel room and they have just activated his "kill switch" and you promptly get swarmed by like 8 enemies and you either fight through this horrible scenario or you 'die' and get locked in a jail cell with all your hard earned goodies taken away. Not fun

so I usually stop here. In fact I always stop here. The gameplay aint worth the tedium!
/rant ovar!