My G1 stopped working Friday night, the display and everything lit up fine, but it would not respond when you touched it. I had to use the little ball thing to navigate through menus, and it would give me an error message when I tried to access my Dialer or Contacts. When someone called me, the screen would get fuzzy and freeze, and I couldn't answer or call anyone.
They are sending me a new one for free though, I still had a warranty until November 7th, thank god!