@ Jwm, selling links is not something I've done before, I have a few PR3, a couple of PR4 and 1 PR5 sites, not sure what the score is with regards to selling links, and what do these paid links look like, just a standard text link?
Do paid links have to be to sites that are the same subject as my sites?
I often get people emailing to ask for a link exchange, and their sites might be to do with things like finance, music, shipping etc, I don't know why they bother, why would I put links to sites like those on a site that's nothing to do with any of those subjects.