Linux

Why don't you just resize your Linux partition? Free space will be added to the current partition.

You can resize your Linux partition as the above answer says and it will work. Depending on what you are doing, if you want to allow Linux to use another partition, here's basically how to do it.
1. Determine the location of the partition such as/dev/hda3 by using the fdisk command without modifying the partition. Use the p command to see locations, then use q to quit.
2. Make a directory you want the partition to be mounted, "mkdir /data" for a data partition, "mkdir /win98" for a partition to mount the windows 98 partition.
3. Mount the partition with the mount command or using the /etc/fstab file so it is mounted automatically when Linux starts.

For complete instructions and an explanation on the fstab file see:
http://ctdp.homestead.com/files/os/linux/usersguide/index.html
See section 13.

I Hope this helps.

resizing, if more then 2 times, not recommended, coz you should change inodes density for better performance, but you can't do it after resize. If you created partition using fdisk, say mkfs on it (see options), and add it to /etc/fstab.