I have an idea! It'd be nice if mods/admins could make notes in user profiles that only people with mod/admin privs can see.
This actually would not be hard. This is a good idea for a mod that I just might code.
I would love to have this. I think many people would. dtm, you may want to think about distribution of the mod if you create it ;)
You can sort of do this with the Profile comments mod
http://custom.simplemachines.org/mods/index.php?mod=436
Just let only Admins and Mods view the comments and add comments