We have updated ET-Prolog. Now it comes with reasonable examples and we have found and corrected several errors during writing these examples.
Now there is simple GPS logger. Unfortunately n900 built in SWI-prolog does not some needed functions, so time is not written.
And now there is example script, which switches silent profile when user sleeps. You can read more here.
P.S. Your scripts in /home/user/et-prolog would not be overwritten during update, so look in /opt/maemo/usr/share/et-prolog/logic for example scripts.
P.P.S. I'm a little bit scared by absence of posts in this thread. Is this project useless or just not so easy to understand?