The next press game I GM (which will be at least a few weeks off) is going to be on the 1900 map, is an attempt to make the game a bit more historically accurate, as well as more balanced. Italy is a lot better, and more fun, and France and Russia are a bit weaker, for example.
Anyhow, your assigned reading is the various basics, notes and essays on 1900, as linked below.
http://www.floc.net/dpjudge/?page=about:1900
http://www.diplom.org/Online/variants/1900-GG.pdf
Edit: Stupid vbul. Use Kattoo's link for the about page or click on the link here. http://www.floc.net/dpjudge/
(Why is it turning a colon into bold HTML tags? wtf?)