Theymos could make an account called "Member BTC addresses" (or w/e) and we could all pm that account. Would that work?
As explained by theymos (in the following quote), you can send a PM to DefaultTrust (
https://bitcointalk.org/index.php?action=profile;u=122551) for this.
It's best to include it naturally in a post. But if you can't, you can send a PM to an account that won't delete it (you could use DefaultTrust for this). After you send it, check your outbox and make a note of the PM's ID (visible in the quote URL).