Have to agree with this! A plain sans serif font is the go!
Also, the keys with shift options (example: ";" and ":") should be top and bottom justified.
The ; and the : are placed at the top of the keycap becasue the LED is under the top portion of the keycap. The switch below the keycap only allows for the LED to be located here. If they were placed at the bottom of the keycap, like nornal, then you would not be able to see them in the dark.