Here are some links that show a sample board I did:

http://i68.photobucket.com/albums/i1...components.jpg
http://i68.photobucket.com/albums/i1...5/2_traces.jpg
http://i68.photobucket.com/albums/i1...races_mask.jpg
http://i68.photobucket.com/albums/i1..._composite.jpg

It's overkill for this board, I know, but it is a good example of the
technique. You can see how it wouldn't work with a scanner because of
the height of the components, particularly the heat sink. As it was, I
had to prop up one end when photographing the traces to keep it level.

--
Nelson