It looks like Goatdemon moved on to try a stage-3 installation instead of his original approach, but I found this thread because I had the same original problem and I may have a clue about its solution.
It turns out that there are two handbooks:
The former is "newer", and perhaps still has some kinks. Perhaps one of those kinks is a missing instruction. Something like:
seems to be necessary, according to the older handbook and other documentation I've seen lying around. Perhaps this is a major omission, or perhaps it's just hidden cleverly, or perhaps it's not necessary. I'm currently in the process of trying this step (after re-chrooting) to see if it installs some of the apparently missing tools, like 'mount' and 'shutdown' (Like Goatdemon, I was asked to login when the mount of /proc failed; unlike Goatdemon, I'd managed to passwd successfully at the very end of my install, though I couldn't do it earlier where the instructions said. Anyway, once I was "in", I confirmed that there was no 'mount' available for for me to run. I tried halting/rebooting and discovered that those basic tools were also not installed. One thing led to the next and this became the evidence for my proposal here.)
Note that I'm completely new to Gentoo -- today was my first attempt. I haven't attempted the installation "all over again", and doubt that would perform any automagic. We'll see how my 'emerge system' comes out (in several hours perhaps)....