RegMan!
 
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RegMan...
regMan is our .NET registry editor for PocketPC and Windows CE.NET
Your device registry is the database where the system keeps common as well as very sensitive information about the device’s hardware and software components and configuration.

regMan allows you to simply view, search and edit all registry information.

Warning: modifying registry information is a risky operation that may cause serious damage to your system. You should not modify any registry entry without knowing exactly the correct values to be set.
regMan screenshots
 
Edit registry values using text, multi-line text, binary, decimal or hexadecimal entries.
You can also decode a registry value by translating entry data to another type. You can, for example, translate a binary value to a string or multi-string to check special data.
Search desired registry locations for a text.
Add keys of special interest to your favorite collection… and reach any of your favorite keys in a click.