Whoa. Though Google and T-mobile squashed root access with the RC30 update it didn't stop people from having fun with it in the few days the G1 was jailbroken. Case in point: Jay Freeman loaded Debian onto the G1. For those who don't know, Debian Linux is another OS that adheres to openness.
What's even better than simply loading Debian onto the G1 is that he managed to get Android and Debian to work together. So you can have Android for your phone purposes and Debian for everything else. A great compromise no? To be sure, the process isn't for the faint of heart so be wary of jumping into this very, very cool hack.
We at Android Central will choose to sit and admire from afar. Don't say we didn't warn ya!