In case you've been trying to keep Google Latitude updated with your position but have become frustrated by needing to keep some app open here's my solution:

http://aketzu.net/~akolehma/latitude-updater.py

It needs python-location package (from extras-devel). Start once to create config file, edit ~/.config/location-updater.cfg and then start daemon with python latitude-updater.py -d.

Still a rather early version with bugs but hopefully better than nothing. Comments, suggestions and patches are welcome.