Well, it might not be exactly what Ginger was after, but I did dig up a Dan Margulis article about this feature. If I eventually write a tutorial, this will probably be my primary source.

You can get free access to this article online, but you will have to register with Electronic Publishing the magazine that published it. Here are instructions about how to access this article:

1. Visit http://ep.pennnet.com/home.cfm
2. Search for "From Russia with Love" (the title of the article.)
3. You will see the article and be prompted to register and/or login if you want to read it.

Dan publishes a regular column Make Ready every other month. This column is printed in both Electronic Publishing and in Photoshop User, but Dan prefers the Electronic Publishing version because it uses his images at a larger size and because the columns are wider.