This week's Nature is a special issue for Linnaeus' 300th birthday, and I've got a feature($) in it looking at what genomics has done for the Linnaean project, in terms of working out the tree of life (and what evolutionary biology can do for genomics). The field is called phylogenomics. One of the surprising things I found when researching this was how uncertain things still are - we have no idea how many of the animal phyla relate to one another, for example.
I'm also talking with Henry Nicholls and Kerri Smith about this on the Nature podcast, recorded at the Natural History Museum in London. Henry has a feature about Linnaeus' raccoon, and has achieved full-spectrum science media dominance by also having a feature($) on metagenomics in today's New Scientist.
Jonathan Eisen's blog is a good place to find out about both phylo- and metagenomics.