Private messages will now notify via email assuming the recipient has the option to allow email notifications checked. Adding notification is one of those things that just took forever to get around to even though there wasn't that much work involved. Hopefully all of you who asked for the notification feature will make good use of it.
We've also added a beta of the Pixel Joint member map using Google maps. It's still a bit buggy, but the major features are working for the most part.