So what does Apple’s iPhone OS 3.0 offer?  Check it:

• Push notification for applications.  That means you can get an IM and not have the app running.  Sweet and finally
• Copy and paste.  Double tap on some text and you’ll get a pop up for ‘cut, copy or paste.’  Double tap again and your clipboard will display allowing you to paste from a selection.
• MMS
• Google and Yahoo calendar support, perhaps among others
• iPhone Spotlight (like on the Mac) lets you search the iPhone’s contents (the app must support it, though)
• Search in mail, calendar and iPod.  This has long been available in the phonebook, so they’re just porting it over
• 3G tethering
• Landscape keyboard in mail and other applications it was not previously available in
• A2DP (stereo) Bluetooth so you can stream your tunes to compatible devices
• Turn-by-turn directions in Google Maps
• VoIP communication with gamers over WiFi – you can talk to them Xbox style
• Rumble pack functionality for games

Availability?  Summer of this year. No exact date was mentioned.  It is free for iPhone users and will cost Touch users $10.  There are a few other features that were announced, but the above are the pertinent ones, at least as far as I’m concerned.