I quit beer for 2010. A year of hard liquor has done me well. I've found a new appreciation for whiskey - although I can't say the same for much else. I am Irish after all though.
I also quit the Beatles, which was good, cos I am sure I'll appreciate them much more now.
Unfortunately, looking at my Last.fm most listened to chart for 2010 I'm still listening to a lot of old bands. But then again mainly their new albums, so that's probably OK (I won't consult my inner-conscience, too afraid of what it has to say).
On the plus side my 10th most listened to album was Homocide Indonesia's The Nekrophone Dayz, which is all about Indonesian genocide in the sixties (an antidote to too much of The Beatles over the years?) and then there's Kill The Moonlight by Spoon. I haven't the foggiest who Spoon are, so that has to be good, they got be sorta indie-edgey-cool if I have listened to them for a year and still couldn't name a single song, eh?
I quit Facebook last year. Not as a new year resolution, but after a realisation that no one had much interesting to say. It's also refreshing not having someone Facebook you and dispel any mystery when they realise that yes, you too look stupid when drunk.