A Way for anon. commenters to leave contact information
Short, concise description of the idea
Have an optional "email" field for anon. commenters, where they could leave their email address and it would not be displayed, but you could click on it to send an email to them (via some system within LiveJournal that would not reveal their email address).
Full description of the idea
Since the invite code thing started, more and more communities have a few non livejournal users watching them. Some of these people are quite active, such as Mrs. Tomoe in the cosplay community, who I would say is probably one of the top ten commenters. I would gladly give such people in the communities I'm part of codes, since it seems to me that they would be good additions to those communities. However, I have no good way of contacting them privately to do so, and if I made a public post about it I'd likely have a few idiots all saying that they are her and want the code, and I can't think of any good way to fix that. She has never to my knoweldge posted her email address. I think a feature like this would encourage anon. commenters such are her to leave a method of contacting them, which would in turn let me give codes to those who have impressed me.
An ordered list of benefits
An ordered list of problems/issues involved
An organized list, or a few short paragraphs detailing suggestions for implementation