add the following to your fstab - but !!make sure there is an empty line at the end of the file!!
/dev/sdb1 /media/Shared ntfs-3g user,noexec,rw,auto 0 0
that means that ... /dev/sdb1 will be mounted at /media/Shared users will be allowed to mount it, you will not be able execute programs from it (good idea, but change to exec if you prefer) its read writeable, and should be mounted automatically.
oh - to test it you can do (as root)
umount /dev/sdb1
mount /dev/sdb1
and it should unmount and then mount happily