I personally use this software and it works great. Never had any problem.
If you are a Mac user and sometimes you need to access and write something a NTFS partition then this software is for you.
Best of all it's free to download from now until tomorrow 6pm.
From the website:
NTFS for Mac OS X provides a unique complete solution and creates an effective communication channel between Mac OS X and Windows. You can browse contents, read and modify files, copy and create new files and folders on both file systems with your Mac OS X. Break down the barriers between Windows and Mac OS!
Key Features:
Completely and instantly access all Windows files and folders with your Mac.
Easy, safe installation and usage.
Unhampered data exchange between PC and Mac.
Share Windows files as a Mac user via external disk drives.
Make any version of NTFS a native file system for Mac OS X – no restrictions, full support!
Detailed Product information is available at NTFS for Mac OS X website.
Limitations: Mac Browser for Windows is not included in version 6.5
I've always used NTFS-3G for MacFUSE.. which is always free..
Looks like this can make an NTFS drive a system disk though! Not sure why you'd want to do that, but anyway.