Zyra's front page //// Affiliate marketing companies
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Also see BannerHound
It's quite simple. You find leads by putting links on your website. For each lead you find, LeadHound pays you.
Other points of note: Don't be put off by the rather severe tone of the legal agreement - they're quite friendly people really!
LINK TO: LeadHound link page (possible cookies, or not)
And obviously you haven't got to put links on the front page of your site! You put them where you think they'll be most appropriate and offer the best service!
Update 2011: According to a helpful Australian company, Leadhound has been inactive for some years now. That's a shame, but at least we can put a final line under it. If you're interested there are other affiliate marketing companies featured at this site.