Need a way to resize NTFS partitions, mirror disk images, or otherwise muck about with disk partitions -- and don't want to use a proprietary package like Partition Magic? If so, the GNOME Partition Editor (GParted) is an excellent open source tool for the task. The GParted team released the GParted live CD version 0.2.4-2 this month, so I decided it was a good time to take GParted for a spin.
GParted handles Ext2, Ext3, FAT16, FAT32, JFS, ReiserFS, Reiser4, NTFS, XFS, and other filesystem formats. At a bare minimum, GParted can detect, read, copy, and create partitions using those file systems -- and, in some cases, can shrink, expand, and move partitions. See the features page on the GParted site for the full rundown on GParted's capabilities.
GParted is actually a front end for GNU Parted, but it's much easier to use GParted's interface than the command line utility.
The GParted live CD bundles GParted, the Fluxbox window manager, and a minimal set of tools to provide a single-purpose Linux distro for working with disk partitions. This is the kind of thing that almost any admin or power user will want to have in his toolbox. You might only use the CD every few months, but it's a good thing to have handy when you need it.