It took me sometime to get E-UAE working on my iBook, it's a bit to slow to be useable (iBook g4 800) but it still comes in handy now and then when I don't have a real amiga around.
As for OS X being simialr in feeling to AmigaOS I couldn't agree more. To me it even is the new AmigaOS, because it is the only inovative OS around and that is what amiga used to stand for (atleast for me). You can't really say that MorphOS or OS4 is inovative, really cool yes but inovative no. When the amiga came it borrowed a lot from the *nix world and made it useable, apple have just taken it a step further by giving us a full blown *nix enviroment that just works.