Just a note, (from a total noob, this is my 3rd day learning RoR). I’m on a Mac 10.4.11 running the MySQL database. I was getting an “unknown database” error, after setting up database.yml and by running the db:migrate. However, I (out of curiosity) tried db:create instead, and all went through correctly. (I hit the same type of issue when doing the Hello World).
Just thought I’d share, although I’ve just had the book a few hours, (I’ll probably get to the bit where you’ve put it in the appendix later :) )