I've been mining bitcoins in a pool for quite a while (slush's pool, to be exact), and I'm currently getting around 7 Mhash/s (at the best). I'm running on a NVidia GeForce 8600 GTS with a CUDA miner.
Is there any way I can bring my hash rate up any?
Use your CPU, it might actually be faster. At least my laptop CPU is as fast as your GPU and I think it probably uses the same amount of power (adapter max is 65W and since that includes power budget for the screen and stuff...) as your card alone
Otherwise, it might not be worthwhile for you to continue, as others have pointed out, you're most likely losing money on the electricity.