Just got my RHEL6 iso fresh from RedHat, I installed it and needed to mount an NTFS partition. To do that you need to install 2 packages:
Once I did that I was able to mount the NTFS partition with no problems. You may not need the dkms package, I just did that with CentOS 5.5 in the past and was too lazy to check if I could remove it. Let me know if there is something easier or better to do.