I've been running some ads on
flashgamefun.com It seems to take a long time (like a day or two) before the ads even become relevent. Google's become relevent within a minute or so. And overall, even after the ads become relevent, they're not as relevent as google. I guess yahoo is still very limited on it's advertisers. Hopefully the payout will be better per click though - I'll have to wait and see.