XM Satellite Radio’s original two satellites are cutely named “Rock” and “Roll.” The company launched a third satellite recently and referred to it only as XM-3, unlike previous press releases for the other two that used the catchy names. Officially or not, however, XM-3 is actually “Rhythm” and XM-4 is “Blues.” Perhaps the new press release writer(s) need to be reminded that a little fun isn’t bad for publicity.