How can I program this web tool?

[Fish]

I play online games (at the moment, City of Heroes). Those games have 'Friends' lists, but they're not very verbose; at best they tell you the person's name.

I want to make a web-based tool, so I can ALT-Tab over to that screen and plug in a player's name, make a few notes, record what day I saw them, what kind of character he was playing, and maybe click on a few buttons like "do not team with again" or whatever. It should save the data somehow, so I can look up a player again later.

What tools should I use to make such a thing? It needn't reside on the Internet; it could just be for my own personal use.