I'd love to be able to use WMA audiobooks on my phone too. Luckily I have a little MP3 player I can use them on, but it'd be nice for the phone to do it too. For now it's only MP3 and Audible audiobooks for Android.
FWIW, the phone I use is the Epic 4G, Sprint's version of the Galaxy S and it does have a slide out physical keyboard. I don't know if AT&T's version of the Galaxy S does or not.
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