From Apple:

What’s in the Box

• iPhone 3G
• Stereo headset with mic
• USB power adapter
• Dock Connector to USB cable
• Documentation
• Cleaning/polishing cloth
• SIM ejector tool (LOL, apparently people don’t have paper clip.)

Specifications

• Screen size – 3.5 inches (diagonal)
• Screen resolution – 480 by 320 pixels (163 ppi)
• Input method – Multi-Touch
• Storage – 8GB (Black) and 16GB (Black and White)
• Cellular – UMTS/HSDPA (850, 1900, 2100 MHz)
  GSM/EDGE (850, 900, 1800, 1900 MHz)
• Wireless data – Wi-Fi (802.11b/g)
  UMTS/HSDPA (850, 1900, 2100 MHz)
  EDGE (850, 900, 1800, 1900 MHz)
  Bluetooth 2.0 + EDR
• GPS – Assisted-GPS
• Camera – 2.0 megapixels
• Battery – Talk time: Up to 5 hours on 3G; up to 10 hours on 2G
  Standby time: Up to 300 hours
  Internet use: Up to 5 hours on 3G; up to 6 hours on Wi-Fi
  Video playback: Up to 7 hours
  Audio playback: Up to 24 hours
• Dimensions – 4.5 by 2.4 by 0.48 inches
  (115.5 by 62.1 by 12.3 mm)
• Weight – 4.7 ounces (133 grams)

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