Specifically, "How do I boot from USB and then do X, Y, Z"?
Luigi: Hexxeh's Cr-48 BIOS Flashing script
I don't plan on flashing my BIOS for the time being, but this is definitely interesting. I have no interest in running Windows or OS X on my Cr-48, but it would be nice to boot from USB.
It's a shame Google doesn't offer a "blessed" way of doing this. I use LiveCDs/USB-based OS's a fair bit and this feature would be great.