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Languages: Logo, Pliant, Boxer, Dylan, Squeak, Inform
OS: Oberon
Computer: Gogo Board, Handyboard, Handy Cricket (or are these gadgets?)
I think you'd be most pleased with the computers; a little soldering, a little programming, a little mechanics, and physical results.
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The computers look interesting, but actually, I am very much not a hardware guy. :-) I can't even stick additional memory in my PC, much less create one using soldering. All that stuff is too "earthy" for me, I guess.
The languages are interesting. I wonder if they have implementations for Zeta/BeOS...
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Language: Boo
Still in development stages, but even Guido has said it looks close to how he'd go w/ Python3000 on python-dev!
OS: Menuet and Unununuminum (or something like that)
Menuet is cool because it is all assembly, and fits on a floppy and has a (basic) UI.
Un... is in very early stages right now, but seems to be exploring some interesting OS concepts.
For something old/dated but cool (and along the hardware lines) check out the connection machines. A CPU organized by multipled mini-processer chips over 12-D and higher (if you pay more) hypercubes. Something different at least. Pity people didn't seem to get past the entry cost of $50K! in the early 90s