Nick Denton highlights a possible problem that one of his readers pointed out:

Because the blogging community contains a disproportionate number of libertarians, it's possible that Google searches on certain hot-button issues will start skewing toward libertarian-friendly pages. Given Google's increasing prominence, this libertarian slant could prove to be more significant than the more familiar concerns about liberal bias in the major networks, and conservative bias on Fox News

While interesting, this isn't exactly a new thing. Anybody who has spent any time at all on Usenet or on broad-spectrum discussion forums knows how disproportionately promenent libertarian views usually are. The only difference is the medium.