An interesting site.
Along a similar vein there is the recent (about 10year ago) book, "The New Dinosaurs" by Dougal Dixon (I think, but I could be wrong), which is a nicely illustrated and very thorough natural history of an evolutionary WI world with dinos not going extinct at the end of the cretaceous. The same author also did a book "After Man" which was a future WI evolution of life after the extinction of man and most other contemporary large mammals, and another one (I forget the title) about a future evolutionary radiation of homo sapiens into a wide variety of new species (I never read this one). Check them out. They should be part of the AH fan's basic library.