Some of the best discussion to be found on the web is at "Bloggingheads". A dialogue I found particularly interesting over the weekend was conducted between a population geneticist [Razib Kahn] and an evolutionary anthropologist [John Hawks]. Here's the first segment which discusses basic issues in human evolution and then spends some time on the Flores Hobbit.
And here's the second segment that considers the recent publication in Science of a new species of hominin, Ardipithecus.
These guys are really good. Fascinating stuff.