We've been working a lot on updating the REST transactions work for Bill's REST-* initiative. The latest drafts aren't up there at the moment but are accessible through the mail archives. The current draft 3 of the atomic model is still called REST-ACID due to some WS-ACID history, but the next draft will see a name change to REST-Atomic Transaction to more clearly call out what the model defines. Then of course there's the compensation based model that will see a new draft going up soon.
On a slight side note it's good to see others thinking about the same problem. Though I think this model has some issues it's good that others have recognized that the problem remains undefined within REST. Of course Eric and Phil wrote about some of this in their updated book (worth a read).