Sunflower is starting to be a interesting app for me to be working on. In the last couple of days (in CVS as of today) I've edited the preferences dialog to include a world map and you can just click on your location to select where you are. The black dot is where I am.
Every time, I work with GTK I find out some more things that are really easy to do, once you do a little reading. Usually the tricky part is figuring out how to get something in the spot you expect it.