This article below explains what a 51% attack is and how you can prevent it.
http://www.btcfeed.net/news/51-attack-explained/
Sorry to break it to you but Litecoin recently had a pool with 51% as well.
The only thing you gain here is switching to a coin that is up against myriad new(not forks of bitcoin) cryptocurrency technologies (NXT/NEM, CryptoNote coins, Qora, CryptCoin ect). And it looks like Litecoin development has no response to the flood of competition.
I don't hold any altcoins right now, but one thing I do know is that there doesn't seem to be much reason to be buying Litecoin right now. It's a coin from 2011.