Take a look at what google adsense has to say on filtering ads... http://adsense.blogspot.com/2009/09/more-filtering-improvements.html Please post your thoughts
I t5hink they should remove the limit. I haven't personally needed more room but we should be able to block as many as we want.
It might be easier but I have never filter any site up to now... but then i have to think of the traffic and the clicks from it. Unless its bothering too much I stay away from filtering except those who jsut just like to go to your site and become a nuisance. Thanks for the heads up