A collection of screenshots showing features of the iPhone OS 4.0 beta firmware.
MobileMe: Notes Syncing

Safari: Search Suggestions

Camera 5x Zoom


SMS Character Count

Multi-Tasking


Folders



Mail: Unified Inbox

Mail: Image Attachment Scaling

Mail: Threaded Messages

Location Services: Allow List & Indicator

IPv6

iPod: Create Playlist


Spotlight: Search Web or Wikipedia

Photos: Rotate

Photos: Albums, Events, Faces



Game Center




Settings: Passcode Lock

*Thanks to iLounge and Neowin for a couple missing screens