Recently I installed Windows 8 in my MacBook Pro (15" with 500GB hard drive, Early 2011 model).
And here is how I partitioned it:
Partition 01 (80 GB) : OS X Mountain Lion
Partition 02 (340 GB) : Common Storage (HFS+)
Partition 03 (80 GB) : Windows 8
Now to access the 'Common Storage' from Windows, I tried 'MacDrive' which didnt work in Windows 8 then I tried Paragon HFS+ for Windows and it worked, now I am able to access both the HFS+ from windows but with two problems in playing media files.
1. Not able to play media files using the Music app from the Metro apps. (Not a big issue)
2. Windows media player is able to play the files from the HFS+ but it doesn't recognize the mp3 tags from the audio files. So I am not able load the same iTunes library here in Windows.