http://www.xs4all.nl/~donovan/hosting/ptscore.htmEach kt minerals counts 3 points, each supply and megacredit counts one point. Each structure equals the score that was necessary to build it, except fighters which count 20 points each (thats the score for a fighter that was built in space). Fuel counts nothing. The space mine score depends on the torpedo score : ptscore will assume that the player used the torp with the lowest possible (ptscore-)score. The space mine score is added to the warship score (this is because torps loaded onto ships count for the warship score and mine laying shouldn't be obvious to the other players).
It works fine and fair in my experience, also wrt torp / fighter races.