Registry Crawler enables power users and developers to quickly find and configure Registry settings. A powerful search engine allows you to find Registry information based on search criteria. Results are displayed in a list allowing you to access any key found with a single click. Registry Crawler has built-in support for bookmarks: you can bookmark any key in the Registry and then access it directly from the system tray. This feature allows you to create a set of Registry keys that you frequently access, eliminating the need to manually open regedit. Registry Crawler is resizable, allowing you to easily view long keys.
More info:
hxxp://www.4dev.com/regc/index.htm

4.01 was released in Apr. Any idea if this is "significant" upgrade? It's a great registry editor. Been using it for a long time. Good to give a heads up on quality stuff like this.