LicenseTracker is a simple C#/SQLite program I wrote.
I'll be re-coding some stuff and releasing it under the BSD license shortly as I need to prepend the license to each file.
At the moment all it does is track Code Keys and Serial Numbers and attributes about those (such as when it was purchased or where an ISO or CD-ROM is located). After I get it re-hashed, I'll add some basic printing features once I figure out how to print on multiple pages -- damnit.
I later plan on expanding it to help store user information, computer information, and store license information appropriately.