I know users already have a reputation score, but what about the languages they use? For example, what if I'm interested to see of all the code-golf questions out there, which users and/or languages come out on top (which get the most accepted or highest-voted answers)?
Perhaps this could include organization by all tags overall, not just the challenge type. Possibly also expanded to be listed by user, i.e. UserX has 14 answers using Perl, 10 using Python, etc.
I think this may require the ability to tag answers, but I can see other ways of aggregating.
Does anyone else see this as an interesting/useful feature? I think based on my perception of use, it would really be meant for the codegolf.SE site, but who knows?