I like all the NPR shows you list, but there's no question, Wait, Wait has shot to the top of the list these days.

I don't listen to the radio all that often, since I keep the car changer stocked with CDs. My other favorite is Disc Drive, 3-6 PM weekdays on CBC. (In the Detroit area, that's 89.9 FM.) Jurgen Goth, the DJ, has nicely eclectic taste, running from classical to jazz to singer-songwriters.