I would like to suggest the idea of having a mini profile link, when a username is clicked in chat. We have already whisper, add friend, and send mail..
A link that opens a popup window or similar that would show the users Level and XP Total.. maybe a few other things..
Also you could make it so if the user doesnt want to show these details, they can choose to hide it.
Hopefully this hasnt already been suggested on here.
Thanks for reading