best not to use "GNU" in the title
From Keyring (ex GNU Keyring for Palm)'s homepage (http://gnukeyring.sourceforge.net/):
The Free Software Foundation has a policy that software bearing the ``GNU'' brand should, amongst other things, run on at least one free computer system. PalmOS, though a fine technical achievement, is not free.
Looks interesting though, whatever the name!
There already exists a GNOME desktop diagram tool called 'Dia'. Calling your independent project 'gdia' (or even 'Diagram') is likely to generate confusion. I suggest you pick a different name, ideally one which highlights the fact that your software runs on the Palm.
An open, cross-platform journaling program.
A scientific plotting package.