Inserting an audio CD causes it to appear in rhythmbox as a new source (with a nice icon, and an "import" context menu command).

It would be nice if when inserting any data media with musics files (e.g. I have a few mp3 CDs used in my car stereo, or a USB memory stick with ogg files) this could also appear as a new source automatically - so I can listen to the tracks WITHOUT having to import them into the library.

As with an audio CD source, an import context menu would be nice but this just needs to copy the files to the library.

See also bug 128408 comment 21 by James "Doc" Livingston:
> In regards to mp3 cds: by basing it on some of the stuff I've made to get
> audio cds working again, it would be relatively trivial to make mp3 cds
> show up as a new source (and not have to store them in the main DB).

And also bug 128408 comment 23 also by James "Doc" Livingston:
> In 0.8.8 if you put tracks on an mp3 cd into your library, it will
> automatically be deleted from the library when the cd is not there;
> in CVS they will be hidden (effectively deleted from the library)
> until the cd is re-inserted.
>
> I'll add mp3-cd support to my list of things to do.

As noted by Colin Walters in bug 128408 comment 26
> The mp3 CD case seems like the same problem as other removable mass
> storage; all of those should show up as separate sources.

e.g. I might have a music collection on my USB memory stick.