It's not only Litecoin. Many alt-coins are rallying (see Vircurex):

NMC: 0,003 -> 0.02 (7 times!)

PPC: 0.0002 -> 0.0005

DVC: 0.0000009 -> 0.0000013

TRC: 0.001 -> 0.0017

I think some people got nervous at the > 100 $ bitcoin price and are parking their money in altcoins.