I think it might be useful to provide a bibliography for those wanting to learn more about restoring and maintaining saws. Below are the references I recommend. I hope that you will add to them by posting additional ones in the comments.
--Matt Cianci's website devoted to sharpening, maintenance and use of handsaws.
--Bob Rozaieski does a great job using and teaching others about vintage tools. In addition to this podcast about saw sharpening, he restores and sharpens handsaws for others.
--Lots of information about saws, this site also contains templates for a variety of ppi that are very helpful for restoring and/or retoothing saws.
--Saws and accessories for sale. Contains a good primer on saw filing.
--The authoritative reference on Disston saws.
Hand Saw Sharpening, by Tom Law
--A highly regarded DVD
Popular Woodworking Hand Saw Value Pack
--Three DVDs, including two about handsaw maintenance by Ron Herman and one about building a saw bench with Christopher Schwarz
Saw Sharpening by Paul Sellers
--An online video (requires free registration).
Lie Nielsen saw sharpening videos (rip and crosscut)
--Two videos by the owner
Daryl Weir's tutorial on saw restoration
--Daryl restores and sells vintage saws.