Ugo.com has a list of the Top 50 Hottest Sci-Fi Girls. If you can get over the fact that you have to load a new page for each one, the list is pretty good… most of what you’d expect (Megan Fox, Virginia Hey, etc.) but with a few nice unexpected blasts-from-the-past such as Dorothy Stratten from Galaxina.
Top 50 Hottest Sci-Fi Girls [ugo.com]
