great work.

- between 420 and 499 in lowest screen resolution (windowed mode)
- between 200 and 250 in highest screen resolution (windowed mode)
- always 59 FPS in full screen mode

GF 9800 GTX

I saw some gaps between some objects and shadow map.

Did you ever test with lots of foliage like a small forest? Does it work similar?

I have something like this in mind:
http://www.garagegames.com/community/blogs/view/16853
(they use some split shadow mapping for large outdoors)