NTFS-3G

Mac OS X can read volumes formatted with the NTFS file system, which is for Microsoft Windows operating systems.

Reading information can be done without a hassle, but writing information requires an external device.

The application that makes it possible is the reading/writing driver originally from Linux called NTFS-3G, which must be used along with MacFUSE.

After installing both, you can write in the Windows partition that you've created with BootCamp, or in any other disc drive that the NTFS file system uses.