Attention all iPhone users: you can now upgrade to the final version of Apple's iPhone OS 3.0. Plug in your iPhone, open iTunes, select the device, and hit "Check for Update." Just make sure you're using iTunes 8, says Apple.
The new iPhone system software includes a plethora of enhancements, including the ability to copy and paste text, use the keyboard in landscape mode, send and receive multimedia messages (only on the iPhone 3G), search the contents of the device instantly, buy iTunes content straight from the phone, and more. The folks at AppleInsider have posted a more detailed list of new features and changes.
iPhone OS 3.0 should support all revisions of the iPhone released so far. iPod touch users can upgrade too, but they'll need to shell out $9.95 for the privilege.
Incidentally, AT&T has announced that folks who own an iPhone 3G may be eligible for an early upgrade to the new iPhone 3G S, which is coming out on June 19. The carrier states, "We're now pleased to offer our iPhone 3G customers who are upgrade eligible in July, August or September 2009 our best upgrade pricing, beginning Thursday, June 18."