XM is great. I listen to Ethel too. I thought boneyard was a Speed Metal station
So I've never listened to it. I may have to give it a try.
XM Cafe is my most played station.
I'll agree with you, those comedy stations make excellent travel companions. I took the wife and kids to Disney in the spring (trip from h*ll) and XM comedy was the highlight of the whole week for the Missus and me!
What hardware are you running?