Separate radio streams and spoken MP3s from music in iTunes

Here are two problems that have frustrated me with iTunes for the longest time:

My iTunes library contains a few entries that are not really music (e.g., comedy or spoken word), and I don't like them cluttering up my "Music" library.
I have a few streaming radio stations that I listen to often and are listed in my Music library as well. Unfortunately, each radio station has its own special genre (e.g. "Eclectic, Alternative, NPR, Public, News") that doesn't correspond with my own classification scheme. True, you can change the meta-information of a stream, but it reverts back the next time you play it. I've seen this problem described in numerous Mac forums, but without a satisfactory resolution.

My solution (and it's a bit of a hack) is to select these items (streams, comedy, etc.) in iTunes and classify them as Audiobooks (by selecting the items, choosing File » Get Info, selecting the Options tab, and changing Media Kind to Audiobook).
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