Apple’s announcement of the iPhone OS 4.0 brought some much needed updates to the iPhone operating system, a few surprises and some disappointments. 4.0 is available right now in a beta form for developers, it will be available for iPhones and iPod Touches in June and for the iPad in the fall.

While we won’t know every single update and enhancement until OS 4.0 is ready Apple did announce the highlights and the 7 “tentpoles”:

• Multitasking
• Folders
• Unified Mailbox
• iBooks (for iPhone)
• Increased enterprise support
• Game Center Social Network
• iAd