It's OT but I can't resist: I recently found out that a selection of these little "synths" have been implemented in the chipsounds VST instrument using its bandlimited oscillators. You can play them up and down the keyboard and they sound awesome.
Wow, that is really lovely .. thanks for pointing that out!
(I'm really more of a hardware guy myself, love to strip the SID's from any C64's I find in the trash .. and of course synths (analog and digital) are really a different subject altogether .. but I'll check out chipsounds on a DAW next time I get a chance. Ta!)
http://countercomplex.blogspot.co.at/2011/10/algorithmic-sym...
Most of these would also fit in a single tweet ..