Average CPC & Selling Ad Space from Aaron Wall over at SEO Book looks at how WordPress is now selling text links on its home page for $10,000 per day via AdBrite. What! Isn't selling links bad, and didn't WordPress get busted for doing something like this before? Short answer -- this isn't going to cause any Google or search engine problems like WordPress had before.
AdBrite seems a safe way for WordPress (or anyone) to make some money and not get back in hot water. Let's not have any pitchforks grabbed and thrust WordPress's way as somehow screwing with search results.