Im pretty excited, and im not sure why its the case, but my site top100arcades.com is now ranked number 1 for the search "arcade topsite", but not for "arcade topsites" hehe probably because the exact domain ranks #1. The question is how do i ensure it stays there. Other than getting more sites to signup and therefore getting more inbound links, what else would you suggest. Or should i just leave it for now and see how it pans out over the next couple of months. Its a minor victory, but in my very short time making websites im pretty happy about it. Also iwebtools PR predictor, predicts PR5 next update...which should also help a little (I know you can take it with a grain salt..but still)
Keep using those keywords, though not more than 4-5%. As above: onsite (content, mark-up, inter-linking), offsite (links, links, links)