I have formatted several drives with Disk Utility on 10.5 as NTFS and they are useable on the mac (read and write and disk utility reports that it is NTFS) but on a windows machine the filesystem cannot be read at all. In order to view them in Windows XP I have to reformat the drive on the windows box as NTFS and then the drive is usable in both Mac and Windows.
+2
NTFS-3G
SimplyRAR