It's pretty cool seeing what people are doing out there. I like when people replicate things that are super rare -- like the Mark-8, SCELBI, etc. And it's definitely cool to see projects like the Altair clone, with its big empty case, all the hardware being emulated by a tiny little replacement inside.
I think the Amiga project is neat, although personally I'm not sure I'd find a need for one. The thing about the Amiga was its wow factor -- I remember walking into Compucentre (Canadian chain) in the mid-80s.. and there's all the computers from 8 bit heaven and their 16 color graphics (if you were lucky).. and then there's this one computer on a pedestal featuring a totally real jungle cat prowling onscreen. It just blew the doors off everything else there, and I would go wanting for one for 20 years afterward (now I have 5 :)). Not sure a replica can revive *that*.