It's been a while since I've bothered to look at ning, but this time around I was VERY impressed. The interface is slick! Kudos to Elizabeth and Ben for setting this up, and of course all the people at ning for the cool platform.
The site already has a good start with a few members on it and discussions already starting for getting to know fellow members and opinions on moving to make this official PHP Community page.
If you'd like to check it out or get involved in the effort, head over and sign up.
UPDATE: it's been six hours since this initial posting and the site already has 24 members registered and growing more all the time. Head over and sign up now! And check out this new post over on the Zend Developer Zone for even more info.