I have released an updated version of my PyWeek4 game competition entry, PROBE.
In PROBE, you get to plan and execute space probe missions to other planets, using a fairly realistic (except for a couple of things) simulation of the physics involved. This version has been greatly expanded, and can actually be played in a deliberate way now instead of just trial and error like the first one. Currently available here: http://www.cosc.canterbury.ac.nz/greg.ewing/python/PyWeek4/Probe-1.0.zip -- Greg -- http://mail.python.org/mailman/listinfo/python-list