At the National Review’s Bench Memos, Ed Whelan discusses the decisions here. At Crime & Consequences, Kent Scheidgger had posts here and here.
At Volokh, Orin Kerr discusses the cases here, and highlights a notable portion of the Chief Justice’s dissent here. At Above the Law, David Lat has a post on the decisions here. Capital Defense Weekly spotlights the Abdul-Kabir and Brewer cases here (via Sentencing Law and Policy).