To me Airtime seems like Chatroulette done right -- user authentication, tools to interact with eachother, harder to post nudies... Now to see if it catches on...
You're absolutely right that Chatroulette is done wrong, the product sucks in so many ways, but what Airtime have done is take one of the parts that doesn't suck and "fix" it.
You are not anonymous to Airtime -- so you can be held accountable for your actions in the public areas of the site. However, you are always anonymous to new people that you meet. We do not send your facebook id, name, or geolocation to anyone you don't know until you mutually friend them.
[1] I see "Anonymous You are anonymous until you send an add request" but that's after I started to search for people just now to check, I would never have got that far if you hadn't explained about anonymity.