Howdy,
I've just released a sky shader for SL2. It attempts to render a pretty realistic sky, but without clouds or any ground features. It can also be used to create environment and IBL maps. (see documentation for this)
Here is the shader, and a sample environment map:
http://hyperspace.isnnews.net/misc/Sky1.zip
http://hyperspace.isnnews.net/misc/sky_env.jpg
An image created with this shader can be seenin this thread:
http://www.3dgladiators.net/forums/s...&threadid=4947