- viral communication:
people talk about fun stuff they saw somewhere
example:
http://img259.imageshack.us/img259/370/seagalep5.jpg
same thing with a small reference to the website.
- video and picture post on famous website.
- produce a flash game (a viral one is better)
- produce a software (get backlink)
to best idea is to produce a software in which the user need to access your website.
- make a forum
it makes text, and text is google food.