Version 0.1 of gmtkbabel has just been released! 
It consists of a set of shell scripts, which use zenity to give a nice GUI over mtkbabel.

Future improvements might include providing a Qt alternative (and the "g"
in the name might just mean "GUI" instead of "GTK" then), and whatever users
need. It might also become something more serious, written in a more complex
language, who knows 
Many thank to Elena ``of Valhalla'' Grandi, who started this project to help some users on #osm-it@oftc.