You don't see very many commercial tools for the registry. I recently ran across RegSafe which has some rather niffty features for Windows NT, Windows 2000 and XP. It does everything that regedt32 does plus :
Protected Environment
RegSafe automatically saves a copy of the Registry before you edit and has "Undo" functions available while editing the Registry. Unlike other Registry editing tools, a mistake made while editing with RegSafe won't trash your system.
Registry Comparison
RegSafe goes beyond simple Registry Editing with its powerful Comparison features. Compare Current or Snapshot Registries, compare keys/values within the same Registry, compare access control lists (ACL) on Windows NT/2000/XP systems. You name it, RegSafe compares it!
Powerful Export Features
Administrators and other advanced users will appreciate RegSafe's export feature, which allows portions of a Registry or Registry comparison results tree to be exported to a .reg file (Regedit4 format).
Partial or Full Registry Restoration
If an unwanted change to the Registry was made, or a problem with the Registry is detected, RegSafe can perform a partial or full restoration of a Registry snapshot to the current ("live") Registry.
Registry Restoration for Non-booting Systems
RegSafe's Command Prompt SOS technology can restore the Registry even when your system will not boot into Windows. SOS restores the Registry on Windows 9x, ME, NT, 2000 and XP systems with FAT, FAT32 and NTFS-formatted drives. In addition, RegSafe provides Recovery Console restoration on Windows 2000.