Top MBA Programs Accepting GRE
The list is short but notable: Darden, HBS, MIT, Stern, Stanford, Yale (see the full list here.) For the record, Wharton will NOT be accepting the GRE until next year, for the Class of 2013. (link)
As with the IELTS/TOEFL, you can bet more and more top programs will be accepting GRE in the coming years.