I apologize then – I interpreted your response as sarcasm.
As for your question, I currently feature several poker rooms on one website – but that fits with the theme, which is poker room reviews.
Anyway, I’m sure it all depends on your site’s theme, and who you are trying to target. Like if you are creating a “how to play online poker” site, then promoting Party Poker solely might be a good way to go. If you are trying to attract more experienced players, then Absolute Poker, Bodog Poker and Pacific Poker might be good (as there are a ton of fish on those sites that experienced players can clean up on).