Cross site advertising?

I just had a thought for a quick post, so while my build is running, I thought I'd throw it up.

Following is a list of sites or blogs I currently have my hands in:

1. fmpthoughts.blogspot.com - this site
2. personalblogsite (url not shown) - I have a personal blog that I write to as well.
3. flickchat.blogspot.com - a movie review site I setup in hopes of getting some of my friends to write some movie reviews. I'd like to get enough traffic on the site to see if we can actually get a check from google for the ads.
   
4. d5ee.blogspot.com - this blog is related to engagedencounter.org with the intention of being a better way to track district 5 news.
   
5. utahee.blogspot.com - this blog is related to the local community portal on engagedencounterutah.org and is where the local community news ends up.
   
6. retiredartandcollectibles.com - this is the beast that will maybe make some money one day.
7. engagedencounterutah.org - this is the local engaged encounter site for the SLC community. I could go on and on about Engaged Encounter, but essentially it's about marriage preparation. This site consists of the public site and the community portal.
   
8. engagedencounter.org - I'm only responsible for a small section of this site, but this is my newest adventure so I'm sure my role will grow over time.
   
9. slc2009eeconvention.com - another Engaged Encounter site. This one is for the convention that the unit (set of communities) is having here in SLC in Aug 2009.
   
10. heavytruckmanuals.com - this site is actually making money, but not directly through the site; this site is setup to help my mom sell truck repair manuals