I dont know about you, but i think I own like 20 domains. And although that is not a great number, sometimes its hard to keep track of all the information on them.

Which registrar is it at? What was the ftp account info? What email accounts do I have set up for that domain?

Well for those of us that are lucky enough to use a mac, i have found a solution:

Master of my Domain 1.0

This program allows you to manage all your domains, and the information about them that is critical. It even has iCal integration to remind you about domain expirations.