CougTek
Hairy Aussie
I found an interesting article at OSNews.com comparing 5 different desktop environments. Criterias were Look and Feel, Usability, Consistency, Integration, Flexibility, Speed, Stability and Bugs and Technology, Programming Framework, Conclusion
Also note that this is a quick overview. We can't possibly cover these environments in-depth, as that would take not five pages, but probably one hundred and five. I am sure that our readers will agree on some points while they will disagree on others. This is fine and normal, so please keep the discussion in our commenting area intelligent and calm. What we are comparing here is the overall user experience generated by these desktop environments and their underlying OSes.