Hi!
My site provide many clients register their domain name, and some of them are not using their domains, also, I have many domains myself, I wonder if I can create a domain parking service for my clients, I got programmers can do all these work, but how can I get ads on my pages ?

I know Google Adsense and Yahoo overture are the one of the options, but my situation is not put ads on one site, it's 2000+ sites, and every site might need to define their keywords, any suggestion how to find a ads network to signup to ?