Many brands of equipment that have only a 2 conductor cord do not have the chassis grounded. I have a brand new Onkyo T-4555 HD tuner, Sony XDR-F1HD HD tuner, Marantz CD5400 CD player, and every turntable that I have, without a grounded chassis. In Frank's case, the line leg of the 120 volt hot side goes immediately into a line fuse as I'm sure is the case with all other 2 wire components. The ground is simply not necessary, even with a metal case (as all components I have mentioned) and introducing a ground to the case, while not "unsafe" may cause noise or ground loops typically associated with 3 prong components. I am simply amazed how many people praise Frank's equipment, but then chastise him for not offering an unnecessary grounded scheme.
If you will notice on a polarized outlet, how many think the wider vertical slot on the left is the hot? Well, it's not, it's the neutral. Then I wonder how many DIYer's have the neutral side fused and the hot side unguarded?
Wayner 
You can still get ground loops with an "ungrounded" chassis. Also, grounding the chassis helps to prevent RF from entering or leaving the device. Of course, whether this is a benefit or not is a function of many variables, the main one being the device itself.
The only item I own that does not have a grounded plug is a AV receiver. Pretty much everything else has a grounded plug. (We're talking audio gear, here.)
