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This is T-Mobile’s first commercial advertising the G1. “Questions.”
T-Mobile’s “Shark” commercial for the G1.
Another G1 commercial from T-Mobile. “Hot Dog.”

 
Thanks to living_sword over at ModMyGphone, it looks as though the age of skinned Android phones has begun. Thus far, the mod requires a Jailbroken phone and the status icons are the only items to be altered.
 
The process is a bit complicated, but hopefully an application will be developed to allow for easy theme changes. 
Skinning [...]

I am currently using a G1 on a T-Mobile account with the Total Internet add-on. Up until today, everything has worked flawlessly. This morning I started receiving the below message in the web browser when trying to acces the internet:
Plan Required
Your current plan is not compatible with the T-Mobile G1. Please visit T-Mobile.com from your [...]

Quite a few people have reviewed the T-Mobile G1. Below are some of the more popular and in-depth reviews:
The Boy Genius Report
PCWorld
PhoneNews
ZDnet
Chicago Tribune
MSNBC
All Things Digital
CrunchGear
Mobileburn
Engadget
PhoneScoop
Gizmodo
BoingBoing Gadgets

A post over at Tmonews Forums outlines a method for sharing the G1’s internet connection over USB. The method isn’t exactly plug-and-play, but is a step in the right direction. 
Here are the instructions:
 

Install the app on your android phone, by clicking here (from your phone browser of course)
You might have to change your settings to permit apps [...]

The T-Mobile G1 is currently sitting at fifth place in Time’s Gadget of the Year poll.  The G1 is the only mobile phone on the list, but the current top five are all internet enabled devices.
Read

A member over at Android Community has found instructions for updating the G1 from a MicroSD card. These instructions may come in handy for the many G1 users frustrated with the random OTA update distribution. As is the case with the flashing of other gadgets, there is a risk of bricking your phone. Proceed with [...]