openid and google would be handy, but that's just me, not sure on the masses. Will sign up for watp and get started.
Tiles have a creative element, scarcity and a time constraint. I always wind up getting hyper competitive and tearing through as many as I can in a session. It's an evil crack-like substance for arty types.
Sorry, tzigla auth is not gonna happen. We can add other providers tho if people really hate both twitter and facebook.
ps: in the meantime, you could sign up with with: http://www.wayofthepixel.net/pixelation/index.php
We have custom one click integration with them, they're our lovely shiny delicous first users.