Here is a little 780x based power supply circuit. It is released as open hardware, the zip file contains BOM, Overlay and Trace file as well as a diy file for use with DIYLC which you can find here http://code.google.com/p/diy-layout-creator/
The trace file in the archive has already been flipped over for laser toner transfer method of PCB manufacture. Have fun and remember this can handle a MAX of 1amp only if you have a heat sink on the regulator.
Here is the link to the files http://rapidshare.com/files/459232217/780xPS.zip