WRTI's Classical/Jazz numbers don't appear to have been affected by the Christmas listening patterns.
WXPN's December (holiday book) numbers were down significantly. For the past 6 years or so, XPN has done specialty programming in December (80s A-Z, top album tracks of the 70s etc...) but they didn't do that this year.
XPN's annual member drive appears to be healthy though. I called in to donate to an overnight (1 AM to 6 AM) specialty program and most of the high-dollar premiums ($200, $400 and up) were gone within the first half hour of the five hour program. That didn't happen last year. More retired listeners with disposable income must be kicking in. It's a great position for them to be in right now, though eventually they're going to have to appeal to a younger set. Same situation NPR is in right now.