Profile Update Log

[Elenna]

I'm looking for a modification that will have a log (separate page?) of the changes people make to their profile (preferably certain custom fields).

I run a game guild site, and the game does not have an internal log of when people gain levels, complete quests, and so on. Thus, I've created a large number of custom fields, and I think it would be really useful to be able to see when someone changes something in their profile.

Obviously I would not want things like a change of email address to show up.

At its simplest, a page with a log like:

JohnSmith modified their level. Was 35, is now 38.
AmySmith modified their Game Status. Was Not Away, is now Away - 11 to 20 days.

Most of my fields are text boxes or drop-downs, which are stored as text. I realize that multi-option check-boxes would be very difficult, as they are stored as numbers (binary?), and since I don't have any, I wouldn't need the functionality to be there to parse those.

At its most complex, in addition to the above with usergroup security (view) maybe a "What are my friends up to?" page where it shows people the same info on their friends, with privacy settings.