I would say join up with www.linkmarket.net and www.link2me.com for a start.
And exchange links only to relevant webistes (ones in the same category as yours,) as links in from off topic sites will actually harm your search engine rankings.
"Google goes far beyond the number of times a term appears on a page and examines dozens of aspects of the page's content (and the content of the pages linking to it) to determine if it's a good match for your query."
Quote from: http://www.google.com/technology/index.html
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