Free NTFS 6.5 for Mac OS X on 19 November 2009
Mac OS X can read NTFS-formatted volumes, but it can't write to them without additional software like Paragon's NTFS for Mac OS X. Today only, the Giveaway of the Day site is giving away version 6.5 of NTFS for Mac OS X, which isn't the latest version and may not be fully compatible with Snow Leopard. But it's free and could be worth trying if you need to write to NTFS-formatted drives. The current version 7.0 - which is Snow Leopard-compatible - normally costs $39.95 but is available for $19.95 at the moment.