Serif Software takes some getting used to but if you can't afford PhotoShop and don't understand GIMP, give it a whirl.
Play Scrabble online. You have to download the interface but it is definitely worth it.
The ultimate word judge and word study tool Zyzzva.
My favourite online German translation dictionary is Leo with translates between German and other languages. The forums are really useful for working out those tricky phrases.
My favourite online comic strip (for computer geeks) is xkcd.