Publishers Weekly reports on Perseus Books Group's plans to eliminate entirely the Carroll & Graf and Thunder's Mouth imprints as part of their integration of the Avalon Publishing Group. C&G and Thunder's Mouth, of course, were the only two Avalon imprints that had any substantial SFF publishing history -- C&G in particular with the "Mammoth" books and others, usually coming from the UK.

Edward Champion has a round-up of other comments on the changes-- not postive, as you would expect.