Figured I should post a newer version. This build includes pretty broad registry browsing (especially if you can use the AllCapabilities version) and (in the AC version) also fairly broad file system access. It also includes the ability to download .REG files. There have been tons of bugfixes and performance improvements as well, plus a slightly better UI in both the app and the web interface.
For more info, please read the forum post here: http://forum.xda-developers.com/showthread.php?t=2355034
To install this app, you will need to have your phone developer-unlocked so you can sideload applications. Use a phone deployment tool (such as the one in the SDK, or Windows Phone Power Tools) to install the app; no other way will work right now. To install the AllCapabilities version, your phone will need to be capability-unlocked. For more info, see http://forum.xda-developers.com/showthread.php?t=2435697