Hi all! Good to see there's somewhere to discuss all things NeXT!
I'm not sure if this belongs in the hardware forum or this one, but I figured I'd chance it. ;-)
I'd like to share my shiny with you - namely a NeXT Cube with NeXTDimension board. But the best bit... autographed by Sir Tim Berners-Lee when he visited our institute a couple of years ago...
It still works perfectly (though monitor inevitably a bit dim these days), and happily runs WorldWideWeb v0.16!

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http://www.flickr.com/photos/brrm/123433786)

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http://www.flickr.com/photos/brrm/4820117799/)
So that was your autographed cube that makes its way around the net.
Great to see it still happily kicking along. :D
Heh, now I'm wondering where else it's turned up. :D
Google the NeXT Cube and it's one of the first image results.
Shoot, I made a special isometric pixel cube with the signature just because it was so awesome.
Oh! I didn't realise that was you. You emailed it to me a year or 2 ago. Nicely done! :)