Been mining LTC for about 2 months now. I do however retarget my rigs for alt coins I see as having a slight bit of potential. I mined about 3k china and feather coins before switching back to LTC. this morning I retargeted for RYC and will probably switch back to LTC in about 48 hours. A day or two deviation only costs me about 60 LTC.
What machine are you using? Wondering if it's worth it to get something from butterfly labs (something on the cheaper end like the 5 GH/s Bitcoin miner) for mining LTC (since 5 GH/s is pretty much a waste for mining BTC atm).
You can only mine Bitcoin with BFL rigs.