Nice find pud. The G1 can still be very useful even on a 2G network, in my opinion. The contacts, calendar, email, and communication apps don't suck to much bandwidth for normal usage. Unless you're YouTubing or downloading large apps, etc., it might be a good idea to hop on the wave of the not-so-distant past.
And while i'm at it - this could be a very, very, (very!?) good thing for a developer to implement into Android. A way to very quickly switch from 2G to 3G and back again. Possibly a long press of a physical button or something therabouts.
I know I would switch between 2G and 3G a whole lot as long as it was easy. I always find myself turning on/off my WiFi to save battery life, and switching from 3G to 2G would do the same thing...maybe I'll post this in the app suggestion thread.