According to this new post from the TEK-X blog today, the online registration now open and has the Early Bird registration prices available.

The Call for Papers for TEK-X is finally over—with more than ten proposals submissions for each slot available in the schedule, our evaluation committee is hard at work preparing the best schedule for what promises to be a can’t-miss event for PHP developers in 2010.

You can reserve your spot via their online registration form and get Early Bird pricing until January 31st, 2010. There's several other discounts you can get as well for government, academic and user group members (and more!)