Travel Diary is an application to write a little diary entry and save it in a csv file. You then can send this file via a script to your server that generates a .kml file for your friends, displays a map.
You can find the sources (including basic server example scripts) here: http://git.senfdax.de/?p=travel-diary;a=summary
You can download .ipk here: http://openmoko.senfdax.de/shr-new-unstable/
more screenshots: http://openmoko.senfdax.de/screenshots/