NTFS is natively supported in Snow Leopard, it’s just not activated by default. You can simply activate this functionality by doing these following steps:
Note: if you use 64-bit kernel, you cannot use NTFS-3G, and this solution is perfect for you

• If you want to use UUID (ID of the disk), do this step, or skip this if you can use LABEL of the disk
  In Terminal, type: diskutil info /Volumes/[Volume_Name]
  
  
• Type in Terminal: sudo nano /etc/fstab
  LABEL=[Volume_Name] or UUID=[Volume ID] and “none ntfs rw” at the end of the line.
  To save and quit, press Ctrl+X and then Y to confirm.
  
• Now you need to restart your Mac and when it is back, you will see this: