TaggedFrog adds audio previewing
I bugged the author of (delicious/flickr style) file tagging software TaggedFrog to add support for audio file previews and v1.0.1 has it. (Make sure you grab and install Croak on the download page.) I'm also told if you need mp3 support to download the irrKlang library and place the irrKlang.NET2.0.dll file in the root folder of your TaggedFrog installation. It'll automatically enable mp3s in TaggedFrog. (It's not included due to licensing issues.)
This is a pretty great solution for Windows musicians looking for something similar to Audiofinder for the Mac. Thanks Andrei!