Have you ever heard of TBWP?
Basically what they do is selling words for $1 per letter. Then, you'll be asked to associate a link with the word you just bought and the next time someone clicks on this word, they will be taken to the URL.
At the top of the site, you can naviguate through an alphabetical list of every word submitted as for today.
Okay, the links aren't worth that much in a SEO perspective since it is not (at all) in context. Still, it is a very original way to attract people to your site.
Personally, I was lucky enough, and I registered both letter 'u' and 'v'. :P
What's your view on this as an advertising method for your sites?