I don' t know who Johnny is or what he's thinking, but blog Johnny's Thoughts has a Rails Quick Reference that just taught me several things I never knew. A database option to the initial rails setup command? Nice. I can't count how many times I've just naturally gone into an editor and changed the mysql stuff to oracle or sqlite3.
Forget about bookmarking it for later, I'm printing it and taking a highlighting marker to it and sticking it on my cube wall.