Last week, Foo Fighters appeared on Conan with special guest Bob Mould. Awesome performance of "Dear Rosemary" from the Foos latest, Wasting Light. Love the front line of 4, count 'em, 4 freaking guitar players!
And if you haven't done so, I recommend reading Bob Mould's autobiography, See a Little Light. It's a cool read. Very insightful into the life of one of modern rock's most influential artists.