I'm aware that in the forums, if the poster is an author then (at least sometimes) the poster name is actually a link to the author page which includes the option to send an email to the author via the SOL system (so not revealing the author email unless they reply).
I'd like the same sort of functionality for reader names as well (if the reader permits it via an added field in their profile) so that a private exchange may be initiated, e.g. to offer a copy of a withdrawn item where the poster's copy was lost for some reason, without triggering the flood of 'send it to me too' messages. So, if a reader permits, their forum moniker would actually be a (script) link which invokes something like the feedback form to send an email to the registered address of the reader.
This probably would also need to be tied in to the 'report abusive emails' mechanism that's being discussed re author feedback, preferably so an identified abusive emailer would have their messages silently dropped.
edited to break up the monolithic bloc of text.
ETA: This would have subtly different functionality from the proposed/coming 'private message' system, but looks to me to be a darned sight easier to implement.