pmac - 4:52 am on Dec 5, 2004 (gmt 0)

>>>I presume someone manually typed it in wrong with the space on their end by accident.

Google isn't into the practice of manually typing urls into the index.

>>>Bigdave your theory doesn't make sense to me

I have been through this myself, and the cause was hyperlinks pointing to the site with a space in the url. Don't dismiss this so easily, it is the most likely cause of the issue you are facing.