The public talents of duotones

My very first MonkeyFist article was on a very nifty technique for producing full color prints using only two inks with near four color quality. It ended with this question:

Now, anybody got a Photoshop plug-in based on this stuff?

I can now answer that question! With no help from anyone! I'm sure this was good for me.

Intense Software has such a plug-in.

I want it! I want it now.

Let me end with another question:

Anybody got a free Gimp plug-in to do this stuff?

(Check back in three months.)