So I've finally divested myself of the last piece of Livejournal infrastructure that I actually used. Plonk. If you have me in your Jabber contact list as "firstname.lastname@example.org" switch that to "email@example.com". (Not actually used as an email address.)
Google seems to realize that my real email address is firstname.lastname@example.org. If anyone can tell me how to make Google's Jabber server believe that email@example.com is my Jabber address, that'd be nice.