OMG!! I accidentally deleted all of the partitions on a drive that was dual booting Windows XP and Gentoo and was worried that I had lost everything. I first tried Active Partition Recovery and after running the extended scan, no partitions were found. Then I used the version of Testdisk included in the Ultimate Bootdisk and it instantly found all of the partitions and recovered them. I was literally back up and running 2 minutes after booting from the CD.