This is the 3rd Generation iPod touch. It was announced on September 9th, 2009. It makes a small improvement over the previous generation; adding a faster processor, doubling the ram, increasing storage capacity, etc.
The iPod touch 3G uses the BCM4329 for Wi-Fi (802.11 b/g) and Bluetooth 2.1. The chip includes 802.11n and FM transmit/receive support, but these capabilities have yet to be enabled by Apple or jailbreakers.
Size: 110 mm (4.3 inches) (h), 61.8 mm (2.4 inches) (w), 8.5 mm (0.33 inches) (d)
Weight: 115 g (4.05 oz)
Battery: 30 hours of audio, 6 of video