This forum uses it.
Looks like there's a field in the profile where a user can specify their real name. It can also be prompted on registration. I guess if you look at the postbit template, and try and work out from there how people's locations get shown then you could turn it into a Real Name hack yourself.
If I spent 3 hours on it a novice like myself might be able to work it out

If I get time I'll have a look.