Yes, Planetbeing has just posted a screenshot his twitter account for his iPhone 4 unlocked (previously) and jailbroken now, The Screenshot below shows iPhone 4 Unlocked and Jailbroken, as Cydia appears down with a list of apps.
Here's the tweet form Planetbeing


Doh, Cydia was on the first page of apps! Here's another shot with it open. Doh, Cydia was on the first page of apps! Here's another shot... on Twitpic





Hey Don't forget to follow me on Twitter to get the video of Unlocked iPhone by Planetbeing very soon!

The jailbreak will be available Soon by Comex