The podcast is called Smartless and it is funny. In each episode, one of the hosts Jason Bateman, Sean Hayes, or Will Arnett seem to actually(?) suprise the other hosts with a celebrity guest. Meaning, one of them books the guest, but the other 2 don't know about it.
They get some questions in, some jokes, some ribbing. It's good.
I'm working my way through the archives but one of my faves so far is Fred Armisen.