Very thorough list… only artist I can think of off the top of my head that belongs there but isn’t is Trentemoller. There is another similar list on psynews here http://www.psynews.org/forums/index.php?/topic/56586-the-best-psychillambientdowntempo-albums-of-all-time-compiled/ that is very comprehensive and is adapted/added to by the members there.
Just note that 80% of those are not similar to Shpongle whatsoever.
Most chillout music focuses on repetitive, rhythm, depth, etc. It’s closely liked with trance and/or ambient music.
Shpongle is very random, and more like world or folk music or something (I don’t listen to this stuff to be able to categorize it).
Something that’s somewhere in the middle, would be Entheogenic, his first 2 albums. Excellent stuff there IMO.
For more like Shpongle, other than Twisted stuff, try Easily Embarrassed. Note that most other stuff on CarDaMaR is once again completely different.