Need a complete display of keyboard layout!

Nice but only ½ done, and sadly not very useful.
Need a complete large display of the keyboard in the language used at the momen, so each key can be recognized for wht it is at this moment/langauge. Can be shown as a large semi transparent overlay on the screen, or smaller (perhaps ~½ size, or ~½ the width of the screen), under the typing area.
Otherwise, how do I know which keys to use when typing in an alphabet of a different letters in a language (say Russian or Hebrew) on my English keyboard? Please let me know if you'll implement this. I could surely use that!