So you want to mine some litecoin? With the introduction of ASICs into the bitcoin mining pools
GPU mining is much less profitable.
However due to the nature of the SCRYPT algorithm litecoin mining with
GPUs should be profitable for the forseable future.
Many people don't know you can use PCIe extenders to hook
PCIe x16 GPU cards up to a PCIe X2 slot.
Some motherboards will have two x16 slots and three x2
slots letting you connect five GPUs!
However, you will have to get 2 or more Power supplies!
Here is a quick list of links to get you started.