That oracle tunning application looks handy - might have to ping you sometime for some advice
Regarding your site you should search on 'SEO' (search engine optimization).
Just by you posting the link to your site in this forum has and will improve your search rating. Google works on how many sites link to you - if a site such as yahoo links to you (as a lot of sites link to yahoo) then you are going to do even better. Basically the more people link to your site and the amount of people that in turn link to them is what determines page ranking.
You should also read up about google bots or spiders. They will search your front page for links and other information which if formated in the correct manner will increase your search placing or determine what keywords will map to your site.
For tips look at other oracle information sites and view the page source.