I tried registering on posterguide.org and the log in seems to automatically fill in your username where it says to use e-mail and your password. If you even try to click in either area, it automatically tries to log you in and won't let you do anything to change your username to your e-mail or even click in the area. It just takes over and tries to automatically log you in with a username and password instead of an e-mail and password, then actually fails. (This is using Chrome on a Mac if the programmer of the site is reading this).
So something is up with the programming, I believe. It's not working for me anyway.
I'm able to look around the site (looks really cool), but registering and logging in is not working.