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Parted Magic is what I've used for several years now, always had success with it, never had issues of any kind.
The tool which keeps being mentioned is GParted. This is present on UbuntuLive{CD,USB} or PartedMagic.
This is a very, VERY powerful tool and can resize/move/etc a large number of partition formats.
May I just add to the mix: SysRescueCD
This also contains GParted but the benefits of SysRescueCD are:
1. Smaller download
2. simple instructions how to "install" to a USB
3. comes with loads of tools specifically for rescuing systems: change nt password, file recovery etc...
And there's always Hiren's BootCD too ...
http://www.hirensbootcd.org/download/