Active@ File Recovery Professional
Active@ File Recovery Professional offers both a quick scan mode for simple undelete operations, and sector-based "super" scan that will pull up virtually everything Active@ File Recovery Professional comes with a partition recovery utility. That's a nice feature to have, because that's ever been written to a partition, or the entire disk if the partition structure is wonky. The interface is a bit technical in its language, but so is the task you're trying to perform.
Sometimes by simply restoring a partition you can get your OS back or recover files using standard copy methods. Like Active@ File Recovery Standard, the Pro version installs under Windows, so you'll need to attach the drives you'll be recovering data from to a working system.
Note: The demo is fully functional with the exception that you can pull off files of only 64KB or less in size. The price is $45 for personal use and $65 for professional use.
--Jon L. Jacobi