Huh, didn't think I'd ever see anything related to Uxn/Varvara [1] make the front page for myself, though it has been discussed before. Neato.
Haven't yet experimented with it myself, but I like the idea; a runtime that is trivial to implement, especially for low-spec systems.
If you make anything in Uxntal, you can run it on your DS, a GBA, or any other machine that can run a Varvara emulator [2]. So if you want a program to last, that's one way to do it!
Uxn pops up every few months. Number of threads dating back about this or 100rabbits stuff in general.
The live music project is also impressive.