Someplace before I ran across a graphic that shows the tech tree choices you need to get to the most useful units/tech such as Fusion reactors, air power, choppers, and the nut/min/energy lifting techs. I can't seem to find the graphic anywhere on the forums (had it before, lost my HD). Help!
And no, it's not Helium pond's teeny impossible to read chart. It's an colorized well laid out chart, printable.