Try adding a folder from your Mac HFS volume into a library in Windows 7 (e.g. your /Users/Username/Music folder). For some reason, I can't get them to show up in the new Windows Media Player. I'm not sure if it's because the volume is HFS or what.
(Before I get asked, my company gets volume licenses of Windows 7 -- that's how I got it).
(Before I get asked, my company gets volume licenses of Windows 7 -- that's how I got it).