NTFS Read-Write App for Snow Leopard / Lion
I've been using Paragon NTFS ( http://www.paragon-software.com/home/ntfs-mac/ ) which I've been using since Leopard and now with Lion. It's good, but I do get the occasional problem once every couple of months. I'd rather buy a supported product as I use it quite often. If it was occasional, I'd probably got for NTFS-3g or other free options.