Ever wished you could use words rather than numbers as iPhone passcodes?
iPhone OS 4 apparently introduces a new feature. Described by our anonymous tipster as glitchy, the screen shot here shows text-based passcode entry.
Moving to text passcodes isn't a huge leap forwards but it's a solid feature that shows that Apple continues to listen to its users as it evolves its OS forwards.
Update: Commenters point out that this capability has already appeared in OS 3.1, via the iPhone Configuration Utility used in corporate deployments.