Enable writing with Apple’s built-in NTFS driver

I am linking to this so I don’t forget

“Compatibility with Microsoft’s NTFS filesystem is sometimes necessary for people who use either separate PCs or Boot Camp. While Apple offers a driver to read NTFS volumes, by default it will not write to them. To overcome this, there are several third-party NTFS drivers available, but in Snow Leopard you can also set Apple’s built-in driver to write to NTFS as well.”