You mean "popuparchives"?
They are a good source of info however.
It's up to Jim, I say no personally. I do some self/station promos, and Cozy has a couple.
The Caamora is to me more of a station identification from an artist, like Dale says - the fact that it mentions them (as jtm notes) is the way it's usually done. I would do these myself (and interviews) but both Jim and I are low-key about it. For instance I could ask Matt Parmenter to say something witty and mention Aural Moon but I just don't.