Impact Factor meet Blog Factor

Postgenomics "collates posts from life science blogs and then does useful and interesting things with that data. For example, you can see which papers are currently being discussed by neurologists, or which web pages are being linked to by bioinformaticians.

It's sort of like a hot papers meeting with the entire biomed blogging community."

They have a nice integration with Connotea and Pubmed. I think the "Blog Impact factor" would be an interesting challange for ISI ( Thomson) to come up with a general impact factor in the future as more and more scientists will share and communicate knowledge through web