The downloads for the PC (simulator) and the manual is he

http://sourceforge.net/projects/xcsoar/files/

The manual is slightly outdated, but can be found by scrolling down
and expanding the line labeled "Documentation".

The program for generating terrain/maps for your local area is:
http://xcsoar.dd.com.au/cgi-bin/terrain.pl

For turnpoints/waypoints and Special Use Airspace, check out the
WorldWide Turnpoint exchange:
http://soaringweb.org/TP
(note the lack of "www" - this is important, do not put it in)

The XCSoar Manual will tell you what file formats you are looking for,
when you go to the WorldWide Turnpoint Exchange.

Enjoy!

--Noel