As we wrote, T-Mobile got all official today regarding the HTC Dream, which is now called the T-Mobile G1.  It runs Google’s Android OS, features a slide out QWERTY keyboard, touschscreen, WiFi, 3MP camera, push Gmail support, and 3G connectivity.  The G1 will cost $179 with a 2-year contract, and launch in the US  October 22nd, although current T-Mobile customers can order it now to be delivered upon release.

T-Mob also built an app store, and Amazon was kind enough to create a mobile version of their MP3 store with access to all 6 million DRM free MP3s.

Unfortunately, the G1 is not compatible with Microsoft Exchange, although you’ll be able to view some Microsoft documents, and T-Mobile’s 3G will only be available in 16 markets upon release of the G1 with more to roll out in the coming months.  Notably, the G1 lacks a 3.5mm jack for regular headphones, doesn’t do Bluetooth stereo and won’t be officially laptop tethering enabled.

The data plans will cost $25 and $35 extra, with the latter plan supplying unlimited text messaging.

Additional feature break down after the ‘leap

• Dedicated YouTube Player
• Google Streetview with built-in compass
• Full QWERTY 5-row keypad that slides away when not in use
• 115 mm × 55 mm (4.53 in × 2.17 in), 16 mm (0.63 in) thick
• Internet navigation button controls
• 3.6Mbps HSDPA
• 1150mAh battery
• 128MB RAM / 256MB ROM
• Qualcomm MSM7201A processor at 528MHz.
• 3.1MP camera (no flash), 2048 × 1536 resolution
• Screen size is 3.17 inches (81 mm) with HVGA (480 × 320)

Official, but vague T-Mobile page here