Paragon Software Group is offering up a free copy of its Partition Manager 9.5 Professional until October 18 (this Sunday). The program is considered to be one of the better partition managers out there, and usually retails for $79.95. It features the ability to enlarge NTFS partitions without rebooting Windows, support for Apple BootCamp, a USB recovery environment, a two-tiered (easy/advanced) interface, and just about anything else you'd expect from a commercial partition tool.
The software comes in both 32-bit and 64-bit flavors, which will run on Microsoft Windows 2000, XP, and Vista. While I don't believe version 9.5 officially supports Windows 7, I have seen positive compatibility reports from users around the Web. Paragon Partition Manager 9.5 Professional has very basic system requirements (300MHz CPU, 256MB of RAM, 100MB storage space), and can be downloaded here.