I've been playing around with a system I'm giving to a developer, and while it won't surprise any of you, its renewed my faith in my OS of choice.
On a system that would run OSX slowly, MorphOS flies.
The interface is clean (and reminds me of what Amiga might have grown into).
Yeah, I own a legacy machine, but when I want to actually do something relevant I move to one of my MorphOS systems.
Looking forward to ver. 3.2, G5 support, tinyGL support for the R300, and Cinnamon Writer (and later even Libre Office, possibly).
Amiga fans ought to be pleased that without a major supporter, the market continues to develop.
Few other old systems have seen anything like this (although the Sinclair and Atari ST developments are cool too).