[Slick]

From the Newbie FAQ:

3.1 You can view the entire research tree by starting a high-tech game and selecting the option for “Players can see complete tech tree” under “Game Options”. This will make 2 new buttons available in game on the research window for the trees. They can be exported via this window to text files if you like.

There is also a word document which lays it out quite nicely in the download section.

Slick.