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Text Link Ads just launched a service called "Post Level Text Link Ads". TLA, you may know, originally sold text links on websites. As feeds burgeoned, they launched Feedvertising, which embedded ads at the bottom of your posts in feeds. Now they're debuting something in between: Post Level Text Link Ads are like the feed ads, but they appear at the bottom of posts on your blog itself. Feedburner also offers on-site ads at the bottom of the first post, so there's increasingly an overlap between the two.
But TLAPL is unique because it allows advertising on specific posts - so if a post on a blog is popular or well-matched to the advertisers' wares, they can buy an ad on that specific post. Wordpress bloggers are invited to install the extension, while everyone else will have to wait.
Text Link Ads was acquired by MediaWhiz last year.