The only third-party utilities I've used since XP got their chop called with 8 - and entirely because of either improvements or new features in the OS itself.
1. ImgBurn - this freeware simple DVD burning utility fell to improved native DVD burning in the OS.
2. VirtualCloneDrive - mooted by native disc-image mounting in the OS.
3. Diskeeper - mooted by Disk Optimizer. (Kicking Diskeeper to the curb was, in fact, the biggest surprise for me, as I have used some version of Diskeeper since Windows 98 Second Edition - fifteen years. However, not only does Disk Optimizer match Diskeeper feature for feature, it includes several features that even Diskeeper 12 outright lacks, and all for the cost of nothing outside of the OS itself.)
Diskeeper and 98SE? Not a stretch - while Diskeeper has been known primarily for NTFS support, it's also always supported FAT, and gained FAT32 support simultaneously with the launch of Windows 98; I recommended it because it would work in any version of Windows, and kept right on doing so after the mercy-killing of Windows ME (by XP). I still recommend Diskeeper for 7 and earlier versions of Windows - just not for Windows 8 (pointless).