All I know about GPE todo is what I've seen here:

http://www.kernelconcepts.de/~fuchs/...ndex.html#AEN7

It seems to do most of what's really needed to be able to run GTD. However, I wonder if there is a way to run back up? Can I attach any type of notes or comments to the tasks? Can I sort them by date of entry? Any knowledge from GPE todo users welcomed!