It would be great if, either by option, plugin, or installable package, sets of popular sources of radio streams were included in the interface.
Ideally the sets of radio streams would be kept up to date. For example, SomaFM makes Christmas related streams available around the holiday seasons, so when radio stations are taken down or put up, they will be reflected in the Banshee interface.
Another ideal option: To be able to add or remove whole collections. If, for example, I want to keep SomaFM and Digitally Imported, but remove Icecast, then that should be possible.
Yet another ideal option: It shuold be possible to bookmark specific streams within collections for easy access. If, for example, the collections appeared in the "Online Media" section of the interface, then one should be able to drag and drop a specific stream into the "Radio" section.
Attached is an example screenshot from the Clementine interface which shows the collection of default radio streams they include.