This is a nice tool.
I did notice that, one time, the screen flickered like crazy. (Using a CRT at PAL60) And I needed to restart the app (and hard power off my Wii) to get it working.
But once I started it up again, it worked like a dream, dumping FireRed, it's save, and the system BIOS. Unfortunately, I can't find the bootleg cart I actually wanted to dump, but I'll get back to you when I find it and dump it.
One really cool feature would be the ability to connect multiple GBAs at once, for dumping multiple games, saves, and what have you. Perhaps you could use the Wiimote, or even each individual GBA itself, to control things.
EDIT: I found two projects with source code - one relating to dumping GBA video, the other to changing the RTC of games that have one. They might be relevant to someone's interests.
https://github.com/endrift/duplo
http://furlocks-forest.net/wiki/?page=P ... ery_Glitch