you would just need to create a fylesystem on the free space you'd have after resizing NTFS, so say it is /dev/hdb2, first format it
cfdisk /dev/hdb2
to linux native, then
mke2fs /dev/hdb2, you can create journaling as well ext3 with -j flag
then create a mount point for it
cd /
mkdir /misc
and mount it
mount -text3 /dev/hdb2 /misc
if everything goes as planned
add the entry to /etc/fstab
/dev/hdb2 /misc ext3 defaults 1 2
and you should be alright
consult man page for mke2fs
and if you want ReiserFS, JFS, or XFS instead use the appropriate tools to create such types of filesystem. It is a little bit off head for me I don't remember the tool names, so
http://google.com/linux should save you a fortune.