Text Link Ads have announced an update for their wordpress plugin. They are trying to sell links in individual posts.
I suspect for a blog that has an individual post which ranks well for a keyword, it could be a cheap way to buy a link. For a large blog with hundreds or thousands of posts, it could be a great new way to earn money as blog archives are often forgotten; but not by the search engines.
I have installed it on this blog, so it will be interesting to see if I can make any more cash from text-link-ads.