Transfer files between bootcamp partitions
You have a few choices:

NTFS in Mac OS X:


Paragon NTFS (US$19.95)
Tuxera NTFS for Mac (€25)
NTFS-3G (free)


HFS+ in Windows:


MacDrive (US$49.99)
Paragon HFS for Windows (US$19.95)


There is a bundle promotion for Paragon NTFS and Paragon HFS for Windows, available here.