If you own several domain names, witch of the following 3 options will get you the most $$$ per visitor. 1. Park your domains with someone like Sedo or Fabulous and let them worry about what to display and share revenue. 2. Auto-redirect all the traffic to an affiliate site that relates to the industry of the domain (after doing all the research of course) 3. Designing a splash page with good info about a subject or industry the domain name relates to and place adsense and affiliate links on it. I'm using all of the above for different domain names and I will post my experience a few posts down.