If you’re constantly glancing at your G1 to check if T-Mobile has graced your handset with the oh-so-slow-to-roll-out RC29 update (“By November 11th”? Pah!), you might be glad to find out that there’s now a way to expedite the process. A user over at xda-devhas worked it all out.
All you need is a computer, internet connection, a way to transfer the firmware to your Micro SD card and half a brain.