I think the only working GPU miner for litecoin right now is Reaper. See this thread
https://bitcointalk.org/index.php?topic=91979.0From the very little I know about it, it might be a challenge for a linux newb to get this running.
FYI - you can see from another thread here
https://bitcointalk.org/index.php?topic=92887.0that we are getting a bounty together for a litecoin version of CGminer. If you want to toss in a few BTC for the project, this will help get it rolling that much faster.
This may end up being the most newb friendly option once it is available.