Unfortunately I might say that ebay is your best bet. Craigslist can be okay sometimes, but you might be waiting a good long while before you find a buyer that doesn't try to lowball or just want individual items. Pawn shops around here are trifling... 2 of them only give $1.00 per game($5.00 for PS3/360/Wii games), I can only imagine how little the local pawn that SELLS games for $3.00 offers, probably like 50 cents each. Retail stores don't seem to fare much better... I think gamestop can be decent sometimes, but if you're looking for cash they're not that good. I strongly advise avoiding those online video game buyer shops, you know the ones where they give you a quote and you ship your stuff to them... they take so long to process your order that by the time they have it they're offering you substantailly less than they initially quoted you.
You can always give amazon a shot I suppose... I haven't tried it but people here say that buyers tend to pay more than ebay, it probably won't be a quick way to sell though.
Or hey, you can always try selling here on CAG.