I just got accepted by Burst Network. I've replaced the top banner with one from Burst...if I like them, I'll replace the sidebar tomorrow.
So far all the ads look more professional, no flashing CONGRATULATIONS sign, and they seem to be paying like five times more than ValueClick, so I'm liking. They're not gaming specific, but Burst will occasionally run targeted campaigns when advertisers ask them to so occasionally the ads will switch to all-gaming.