I recently acquired two old back saws on eBay, to fill out my western saw collection. One was a steel backed carcass saw with no visible makers marks, and the other was a 1920s era Disston tenon saw.
But the condition of the carcass saw's teeth were lousy, and needed jointing. The tenon saw wasn't so bad, but needed some TLC. So I decided to send them off to a saw filing pro, Bob Rozaieski of Logan Cabinet Shoppe and the excellent Hand Tools & Techniques podcast. I've enjoyed learning from his podcast and blog, and seeing as he offers a reasonable sharpening service, I thought I would get these started out on the right foot. My saw filing skills are pretty new (everything I've learned to date is from this site, and trial and error), and I feel better touching up saws that I know are configured correctly, rather than trying to bang my head against saws that started out way out of whack.
Bob turned them around right away, took time to answer at length several questions I had. A really great experience over all. I'm anxiously awaiting their return.
Update: The saws came back in, and were in awesome shape. Thanks Bob!