[ElevenLathe]

Von Neumann style machines have basically won out, but its interesting to note that the PIC microcontrollers follow a Harvard/Aiken architecture, with different address spaces for code and data. There are therefore millions of non-Von-Neumann computers in the wild right now doing real work!

[kragen]

AVRs too. But in both cases they are stored-program computers; you don't have to reconnect the hardware to run a new problem on them. And they are commonly used to run interpreters, the possibility of which was the key insight of Turing's paper.