Currently in the Hearthstone closed Beta (new online card game by Blizz which is free to play), and have to say I'm thoroughly enjoying. You don't realise how addictive it is until you look at the clock and realise how long you've been playing it for. Can play against friends or random people online aswell, and there's also a practice mode. In practice mode if win battles against the hero of that class (say Garrosh in warrior class) you unlock that class and free up the card deck. You can also buy cards either with gold or real currency. and there's also quests and achievements to unlock. Really enjoying it so far even though it's still closed beta.
Also been playing Might and Magic Duel of Champions (another free to play online card game) and it's just as good as Hearthstone. different format, more challenging-a lot of fun. Same thing re: purchasing stuff aswell.
And of course-football Manager 14