This procedure will let you automount your windows partition on Linux in a way that almost any user can read AND WRITE to it.
First, make sure you have ntfs-3g installed (you will also need fuse support, not sure now but you may need to recompile your kernel...)
Now, given this drive:
brw-rw---- 1 root disk 3, 1 Sep 1 18:55 /dev/hda1
put this line into your /etc/fstab:
/dev/hda1 /mnt/windows ntfs-3g defaults,gid=disk 0 1
which will automount /dev/hda1 into /mnt/windows and will set the group to "disk", so any user on that group will have permissions to read and write.
Reboot, and your windows drive will be ready!