At 11:01 AM 3/16/2008, Larry Alofs wrote...
>You can substitute a more commonly available regulator like the 7810
>or
>78M10, but you have to mount it face down because the pinout is
>reversed.

They're not nearly as common as you imply. Neither Digikey, Mouser, or
Jameco carries a 78x10 in a TO-220 package, only surface mount. For
stability, you must also add at least a 0.1 uF capacitor close to the
output.