Ok, so I sign up, and now I have to confirm my email. But...it's not a link I can just click, it's a code. So I switch back to the postbag tab, log in again, and it asks me for the code. I switch to email tab, copy the code, switch back to the postbag tab, put in the code. All a bit obstuse, but ok whatever...I'm done, right?
Nope, now I have to log in again after my account is verified.
That said, this looks really interesting and I'm excited to try it out. Thanks for posting!