what i tend to do is use an external e-mail account for exploit reporting only and using my Nick... never my real name ...yet
here look at this example from today
http://securitytracker.com/id?1013903
ok it states am from GSO... but e-mail account dont point here... i found 98% of vendors i have informed or admins.... respect what you find.... after all...you are trying to help them
some guys... i know have used alias names in the past and have decided to change and use there real names.... fair play ..thats down to them , but they have to tread with care.... in some cases...they could be the Next Adrian Lamo... and end up being locked up
but in general... as long as you state to the admin , vendors etc .. from a security point of view... then you should be ok to report.... in a similar way i do