Those of you welcoming GPU mining for LTC/SC have kinda missed the point of why those currently hold the #2/#3 spot in the cryptocurrency world...
If you're going by market cap, its #1 Bitcoin
#2 SC #3 NMC, #4 LTC
Put bluntly, if GPU mining becomes viable for LTC and/or SC, their entire raison d'etre vanishes. We don't need to decide if we should react if mtrlt releases Reaper13 and it really does work 25x faster on GPUs; We need to decide how to react, and preferably have our changes ready to roll out on the very same day. And while "do nothing" always counts as an option, in this case it counts as an option that effectively dooms this entire branch of BTC variants.
Actually the SolidCoin hash was developed to be fairly equal in performance on GPUs and CPUs, watt for watt. It is currently delivering that and has been for some time (with a small favor to CPUs). SolidCoin takes all consumer hardware that is viable so we can let the widest range of people mine it fairly. Unlike Bitcoin which is going to be FPGA soon and Litecoin (which was supposed to be CPU only and is now a GPU coin), we want everyone to be able to mine.