I just surf through Jonh Chow’s blog today and he posted about new programs from Text-Links-Ads.com, Post Level Text Link Ads.  With their plug-in(Wordpress only), I could sell one text link on each blog post.  Compare to v7n.com program, it is paid in monthly instead of $20 one time.  If you have decent PR blog with some traffic, your blog might generate extra income.  It looks like you could buy $5-$10 per link per month per blog post if you need to build some backlinks.  Process is much easier than other textlink selling program.  Check them out, if you do not have account, they still have $100 free link promotion.  I got approve one of blogs and got around 100 posts are up I guess(I think they only approve with PR1+ posts).