FORGET BONUS WHORING, there is a reason sites like that will show you where all this FREE money is. Becasue in the long run they will make more off of you than you will get from any stupid bonus. Evertime you sign up at one of those sites through one of thier links to get a bonus they get paid what is called "rakeback" on your play for getting you to sign up.
Rakeback works like this:
For every hand you are dealt cards (even if you fold pre-flop) and there is a rake taken every player gets a percentage of that rake counted towards thier Monthly Gross Revenue. Say the rake is 50 cents that hand, and there is 10 players at the table, each player get 5 cents towards their MGR. At the end of the month the guy you signed up through gets roughly 30% of your MGR, AND EVERY MONTH AFTER THAT FOREVER!
To keep the math easy, say you play 100 raked hands a day, which isn't much, and you play at 50 cent tables with 10 people always there, thats $50 in rake or $5 towards your MGR. You do that every day for a month and have a MGR of $150, the guy you signed up through gets 30% or $45. Keep in mind that is not very many hands and at the minimum level for most sites and does not include if you play in a tournament or ten.
So if you play very little and at the minimum level he's getting $45 a month EVERY month while you got a 25% bonus, that sucks.
You need to be the one getting the rakeback, not the guy you sign up through.