Skylight version 0.91
I've put up version 0.91, which you can get here. This is likely to be the last free release so get it while you still can. Assuming no major issues, the next release will be the real 1.0 paid version, although I still have a bit to do before then.
This release adds clouds. I'm still tweaking them a little but they're basically there. I found a bug in the above source code so I've made a minor edit to the Y position calculation, in case anyone's copied it already.