Screenshot of Fon Flash:

The primary improvement in Fon Flash over AP51 flash is that it can flash several different types of firmware. While AP51 flash is suitable for flashing Gargoyle / OpenWrt, it cannot flash the latest official Fon NG firmware which requires three files to be flashed to the device, or the latest releases of DD-WRT (v24 and v24sp1) which require only one file. Fon Flash can flash all of these configurations.
Summary of improvements over AP51 Flash:
- 1) Can Flash Fon NG and DD-WRT as well as Gargoyle/OpenWrt
2) Now works on Mac OS X as well as Windows and Linux
3) New cross-platform GUI, works on all 3 platforms
4) No longer consumes 80% of CPU resources, like AP51Flash
Thanks go to the original author of Ap51 Flash, Sven Ola, and to Steven Leeman who has helped with testing and suggestions. Steven has also set up a site with instructions on how to flash original fonera firmware to any of the existing Fon models using Fon Flash.