Technorati has started its Technorati Advertising Network called Technorati Engage (still in beta) for Bloggers. Now bloggers can place different kind ads e.g. text ads, banner ads etc. Ads can be purchased from a single blog, from a category, or from a network of blogs etc and more and more.
Check it out: https://beta.technoratimedia.com/
As Google hates paid links, would this affect the PR of blog?