after installing Natty Narwhal or Oneiric Ocelot

Top Things to do after installing Ubuntu 11.04 and 11.10
To Do List After installing Ubuntu 11.04 aka Natty Narwhal
https://help.ubuntu.com/community/Fstab#ntfs

FYI:
In 11.10 ntfs-3g is installed by default and the version of ntfs-3g in 11.10 now includes the various utilities that were previously supplied by ntfsprogs. 

You do not need ntfsprogs in 11.10. 

Because it now conflicts with ntfs-3g, if you try to install ntfsprogs in 11.10, the package manager will remove ntfs-3g, but not before prompting you.

You do still need ntfsprogs (if you require those utilities) in Ubuntu 11.04 and before.