It's quite a lengthy paper, but the linked journal article below was the basis for many of the recently adopted changes in frog taxonomy. Rana --> Lithobates, Bufo --> Anaxyrus, etc. This only applies to new world frogs. To sum the paper up in a sentence: A number of genera shared between the old and new world were looked at using the latest genetic techniques and it was determined that in many instances, the new world frogs are different enough from the old world frogs that the two groups aught to be split into separate genera. I don't think it will stop here -- a little more work on the wood frog and its relation to a group of similar frogs in asia may result in Lithobates being broken up into several more groups. Wood Frogs on their own, Bulls, Greens, Minks, etc in a genus, the leopard frogs in a genus, and so on. Not all agencies have adopted the suggested nomenclature due to the constant back and forth nature of taxonomy but I think most agencies will in the near future.
The amphibian tree of life. Bulletin of the AMNH ; no. 297

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