So, look what I wrote today:
https://fedoraproject.org/wiki/Unified_Extensible_Firmware_Interface
(just plain https://fedoraproject.org/wiki/UEFI redirects to that page, too).
It's a (hopefully) not too long and not too technical help for installing Fedora on UEFI systems. Should cover the 'greatest hits' that show up in bug reports, forums and IRC the most.
Corrections welcome, and hopefully this will be a useful resource for some...