2009:

• 45% libertarianism
• 38.4% liberalism
• 12.3% socialism
• 4.3% (6) conservativism
• "not one person willing to own up to being a commie."

2011:

• liberalism 34.5% (376)
• libertarianism 32.3% (352)
• socialism 26.6% at (290)
• conservatism 2.8% (30)
• communism 0.5% (5)

I generally expect LW to grow less metacontrarian on politics the larger it gets, so this change didn't surprise me. An alternative explanation (and now that I think of it more likley) is that the starting core group of LWers wasn't just more metacontrarian than usual, but probably also more libertarian in general.