Hello there! SQL Server 2000, as well as all Office 2000 products, don't store the license key, so there is no product available that can detect keys for those. During the install, they check that your key is ok at installation and then toss it. However starting with Office 2003, they do store the license key and even Office 2010 is detectable.
In the future we plan to add other standard key detection, such as Adobe products, but other than Microsoft, Adobe and maybe Autodesk/AutoCAD, there are no real standard methods to detect license keys.
We'd love to add detection of other software keys, but probably 80% of software apps don't store their key a detectable way, or as in the case of SQL Server/Office 2000, they're not stored at all.