It’s got: 

• 3G speed
• GPS
• Improved audio
• Flush headphone jack
• Plastic back (black on 8GB, black or white for 16GB)

The 16GB model is $299. 

GPS was a big one for me, because I want to be able to use the iPhone in lieu if getting a portable navigation device from TomTom or Garmin. 

I’m smack dab in AT&T’s 3G area so I’ll be able to take advantage of that, too. 

I strongly suspect the plastic back will help overall signal reception. 

I’m 90% certain I’ll get a 16GB model. I have until 7/11 to decide…