These sites are poping out everyhwere and cover almost every keyword. Their only content is the top ten results of Google, Y! or whatever search engine for that particular keyword.
Take the $$ incentive away and they will disappear.
Sorry to vent, just my site's name is all over the place...
I've got the same problem - and I spent most of last week dealing with it, so I'm ready to vent as well. What I've found is that usually a cease and desist sorts them out - most seem quite eager to stay within the law (I guess otherwise the next step for the trademark owner would be to alert the ad network they're running, so they wish to avoid this happening). This doesn't help with the overall quality issue though...