If Your Cr-48 Ever Dies
A couple weeks ago I mentioned that I was lucky enough to get a Google ChromeOS notebook in the mail. One of the first things I did was to switch it into developer mode. I played with it happily for awhile after that, but never really hacked on it. Anyway, a couple days ago I rebooted it, and it didn't come up. I followed the recovery instructions, but it didn't help – it just booted up and showed me the error screen.
Anyway, turning off dev mode fixed it. So, if you ever have this problem, give that a try.