There are a number of simple ways to do this:
1) Ensure your pages are SEO optimised so that the search engines pick up the key terms you are trying to index for
2) Make sure you have an RSS feed of new content and submit this to the RSS aggregators
3) Ensure your best content/pages are in the social bookmarking sites
4) Create some articles about your sites content and backlink to your main site
5) Perform steps 1-3 on your articles
6) Buy some traffic (PPC, stumbleupon, banner campaigns etc...)
Hope this helps!