It would be nice to be able to add a limited amount (like 4?) of tags to the user profile to show other what areas you are most fluent/interrested in. Like If I'm working only with vb.net and sql I could Add [vb.et] and [sql] to the profile.
Those tags should then be possible to see as a tooltip or revealing infobox when hovering the mouse over the userinfo for a question or answer (or comment). It give good information about the questioner/answerer that can be considered when evaluate the answer given, or just to see what language the questioner prefer to have the examples in.
And it makes us a little bit more glued together when we know each others personal language/tools of choice.
Something like this: