Chillingo recently announced that it would be launching Crystal SDK, a service joining the increasingly crowded social network market for iPhone games. Xbox Live on the Xbox is an official social network, but the iPhone has no such official service. A crowd of contenders, from the popular OpenFeint service to ngmoco's Plus+ network, are jumping in and trying to get developers on board with them. Crystal SDK is one of those -- they've now launched the official website and are asking developers interested to sign up and see what their software has to offer.
Like many of the other services, Crystal is offering to integrate challenges, achievements, leaderboards, and other social services into iPhone apps. The SDK seems like it's still pre-release, however -- there's only a signup, no information on cost or implementation or anything else on the site. Still, if you happen to be an iPhone developer still looking for a network to hook up with, they might be the one for you.
While we're at it: what do you consumers think? Have you actually chosen a network to go with, or are you doing what I'm doing and still basically going game by game? The goal of these networks eventually is to have a unified stable of developers, where you'll jump into a new game simply because it's linked to the network you're signed up with (and your friends will be playing over there and encouraging you to join). But in reality, I haven't seen that -- most people I know are just playing the games they're interested in, and the network the games are connected to hasn't made a big difference.