When you say to look at the keywords, do you mean to parse the HTTP_REFERER (which, by the way, has always bugged me that this variable name was implemented with incorrect spelling, it should be HTTP_REFERRER, but I digress) and then redirect the visitor to an appropriate page based on what they searched for? That’s very clever!!
Yes it is, and it’s much too clever for me. 
I am very non-tech.
I was just saying if a person finds you listed in a search engine under “Omaha 8 bankroll” they don’t expect to find a banner for party poker, they expect something to tell them what size bankroll they need to play Omaha 8. Text. And they are likely to read and click on that text. But someone who clicks on “largest bonus on the internet” in the search engine is likely not looking to read about the pros and con’s of bonuses, and he is likely to click on the next banner with a huge bonus advertised.
I’m really just saying that you have to give the people what they want.