OK ... but I still don't see the need for a special application for this task. I keep all my serial numbers, keycodes, activation numbers, etc. in a simple spread sheet. And that file gets backed up regularly to my iDisk.
Column 1: Software Title & version number
Column 2: Serial number
Column 3: Registration number (if applicable)
Column 4: Key Code (if applicable)
Column 5: any other number (you'd be surprised what some software vendors require)
Column 6: Software vendor's support telephone number
Column 7: Date of purchase
Simple, cheap and effective ... and totally customizable.
-DH
ps: I use another spread sheet just for passwords.