Came across this Search Engine Optimization article yesterday (by Rand Fishkin of SEOmoz.org), and it's quite good. There's a few tips I learnt which I'll be adding to the FinalBuilder web pages when I get the time. There's some quite interesting information, for example “it's also important to keep URLs limited to as few dynamic parameters as possible ... In an ideal site, there should never be more than two.” (By dynamic parameters, they're talking about things like this: ?param1=a¶m2=1 that goes after the URL). We don't use any dynamic parameters on the FinalBuilder webpage, but certainly something to keep in mind.
Anyway, it's worth the read if you maintain any websites.