A short list of the pros of RegAlyzer:

• New: Undo and Redo logs in .reg format
• Improved search function (results list)
• Hierarchical bookmark support
• Jump to key by command line parameter
• Jump to key by typing/copying it into dialog (instead of browsing)
• DWord editing with parallel hex/decimal/binary display
• Support of QWord (64 bit integer)
• Display of .reg file contents without importing it
• Support of version 5 files (Unicode) even with Windows 95/NT
• Low-level display of security settings with option to export it

But there are a few not-yet completed features as well:

• Complete Unicode support
• Display and import support for some system stuff (REG_LINK, REG_RESOURCE_DESCRIPTOR, etc.)
• Changing security settings
• Remote connection doesn't ask login yet
• Changing opened .reg file
• Editing binary data
• Working (add/delete/etc.) in remote registry