The Thinking Housewife on one Catholic priest's response to the change in policy: Seattle Priest Rejects Scouting. The Thinking Houswife also reports that the the episcopal liaison of the United States Conference of Catholic Bishops to the National Catholic Committee on Scouting has no problems with the new policy: Bishop responds to Boy Scouts’ decision on admission of homosexual members. This echoes the thoughts of Ed Peters. (More from Ed Peters.)
I think that the bishop and Ed Peters are ignoring the fact that adolescents who publicly identify as homosexual have [probably] already gone beyond recognizing the experience of same-sex attraction to embracing a political or social identity, as Dr. Fleming and the commentators at TTH point out.
From someone who acknowledges the distinction between inclination and behavior and nonetheless is more circumspect about the policy: The Boy Scouts: Caught in the Culture Wars
Fr. Lappe's Response to New Boy Scouts
Catholic Scouts of St. George: How to Start a Charter Troop
Atlantic: What Gays can teach Straights about Marriage