I used to have that in a PDF. Can't for the life of me find it now.
I took three basic rules from it though that I use to this day.
Another good idea is the K.I.S.S. principle - keep file names as short as possible allowing them to still be understood.
There are a lot of SEO factors in file naming that are relevant, but I don't remember reading that in Dowdell's guide.
This is probably the closest to it out there now: http://sweatte.wordpress.com/syntax/programming-style-guide/
Thank you. - Yes, I've got the rules down but I wanted the documentation, it was done so well, for newbies from the MS world who are getting away w/using prose for file names.