Orb Avoidance is a surprisingly addictive little semi puzzle physics game. The little balls will chase your cursor relentlessly, and you have to trick them into smashing into the blocks on the screen. Easy to pick up, but hard to push for too long without dying.
Turbo golf is an interesting golf game, because unlike boring ass golf, it includes zombies, and other awesome. The gameplay is pretty simple to pick up, and there are oodles of upgrades available to ensure lasting hours of non-productivity.