The Editor of BioEssays, Andrew Moore, has just posted several long comments (essay-length in total) about BioEssay's policies concerning blogs and other informal scientific communications. You'll find them at Zen Faulkes' excellent Neurodojo blog.
Dr. Moore's comments are very reassuring; BioEssays clearly recognizes the important contributions that post-publication peer review can make to peer-reviewed science.
A review of Freeman Dyson's "Dreams of Earth and Sky"
3 hours ago in The Curious Wavefunction