hi
I dont think google search is a very good indicator of how popular poker sites are -
this is top 5 or so poker sites based on players numbers / traffic at sites
1. PokerStars
2. FullTilt Poker
3. Party Poker
4. iPoker ie. Titan, BlueSQ, VC Poker, Carlos Poker, Noble Poker
5. OnGame - ie. RedKings, Chan Poker, Euro Poker, PokerRoom
6. Everest
7. IPN / BOSS network - PokerHeaven & Virgin Poker
after that the medium size sites have very similar traffic levels give or take
here is our list of 50
poker site bonuses - with links to our full reviews of all the sites above and more
hope thats a help
cheers scrawnybob