I am in the process of developing these sites:
www.prodjfinder.com
<snip>
and quite a few more..........


Whats the best way to increase the link popularity via having the sites link to each other?

Also could linking to each site increase Google PR?

Thanks,
Ryan

Dont use your own sites to artificially inflate your pagerank, go out and get links from "relevant" webmasters who have sites along a similar theme to your own. Forget the pagerank just go for a volume of relevant links with your main keywords as the anchor text and switch them up once in a while

__________________
Vote for your favorite SEO site and tell your visitors about this great place, please link to us http://www.seo-guy.com with the anchor text SEO and let them know how you feel