Second link to authority sites in your theme, this helps Google to categorise your site.

Thirdly, submit to DMOZ, Google uses this directory to power its own and their combined content to assist categorisation ?

Consider submitting to Yahoo, which has a similar effect, though its price of $299 may not be worthwhile unless you are an e-commerce site.

Then lastly, find ‘on theme’ sites and persuade them to link to your site. Ideally using your key phrases in text.

e.g. Domain name registration – linking through to my domain site Discount Domains Ltd.

There are about 100 factors in Google algorithm , but above aspects are most important at time of writing.

I wish you luck.

Link Farms - Web pages created for purpose of providing outgoing links to other web pages, usually without regard to content or subject are frowned upon. Linking to a Link Farm can have adverse effects as well.

Employing such techniques will rarely prove to be of any benefit to search engine rankings and are likely to get you banned from a search index all together.