I downloaded the Live image from Fedora,and copied it to my USB drive using these instructions. I then bumped up the USB drive in my BIOS boot options and let the computer reboot... to see this message:
isolinux.bin missing or corruptI'd made a small error in the device name of the USB. After copying the Live image correctly, I could boot into Fedora.
The USB boot is stable and fast, and fun to play with.
I'm tempted to install it and get used to it, but this is my "production environment" as computers you occasionally do some work on from time to time are described nowadays, and I don't want to be scrabbling to install a printer or scanner or get email working on a new system.
I haven't used Gnome 3 long enough to say anything other than I'm enjoying it so far, except, why did Fedora make the Gnome icon set the default? The Gnome icon set is dull. The icons look like they were created around the same time as Windows 95.