Submit the site to them, make sure it is well worded, search on it reguarly (from different IPs) and click it in the results to make it look popular.

I used to work for a company where they did all that sort of shit (not me personally i just wrote back end programs for them) and it works remarkabley well if you can be bothered with it, the company i used to work for would guarentee a top 10 place on certain words on google and thats without ever giving google a penny.

As davey says though, works better if you pay them!