Message forum optimizing

Well, i've been reading here for weeks, and running websites for years. It seems like it's time to get some suggestions from the masters here. I run a network of automotie related websites. The "hub" for the network is http://www.sportcompactracing.com . I have changed the way the default archive works in vbulletin by making the url's a little more search engine friendly. I have redone all of my keywords, and I placed links to the archive and other important things near the top of every page in plain text to help drive search engines to the right pages. Following the suggestions in some of the articles here I have added a blog to the site which has been fairly popular thus far. The main forum page has a listing of "network sites" where I have direct links to most of the other sites in the network. Do you all see any other things that would clearly help me out as far as rankings? I appreciate you guys talking a moment to look.