hellooo community !! Long time lurker, first time poster - i just received my new locked,unactivated G1 yesterday - and since I'm outside the US i'll just have to wait till an app or command line process is developed to jailbreak the G1 for use on our local telecom provider ( can't use the friend's SIM Swap trick, no T-Mobile in Dubai, may pay for the 20ish dollar code later)
but on the brighter side -
It looks like the some of the clever folks at XDA Developer Forums have figured out how to get ROOT access to the system via telnet, once you've telneted in - you have root access (how'd that slip by Google??!!

) and one can then mount the entire directory as writeable.
The simple 8 step process (shamlessly copied from original thread, you'll need to get Pterminal from the Android Market to do this):
- Turn on your phone's WiFi or enable USB debugging and hook it up to your computer. This gives your phone an IP you can reach it at.
- Get to a command prompt on your device by using the PTerminal application from the Android Market. (adb shell does not seem to work with these instructions, telnetd does not start up)
- cd system
- cd bin
- telnetd
- netstat (get your phones IP)
- telnet into that IP
- you now have root!
That really improves the possibility for a jailbreak app. coming out soon !!
YAY !
Original Post -
http://forum.xda-developers.com/showthread.php?t=442480