The default Wheezy installation came with the "Great Britian" keymap selected. On my US machine it was ALMOST a perfect match, but the @ and " keys were swapped.
With help from penguin master Stevens, I can offer this quick fix:
From a command line, or console, or whatever those linux people call a shell, enter
leafpad /etc/default/keyboard
which should open an editor with the keyboard configuration loaded. From there, simply change the line
XKBLAYOUT="gb" in to XKBLAYOUT="us"
or whatever alternate keyboard you'd like. Save, exit, and you should be all set!
P.S. I don't know if leafpad is what the "cool" linux users use, but I find it simple and comfortable. Maybe one day I'll learn one of the more cryptic editors like vi or emacs, but not today.
