Good intro Scott. I just start playing with Kerf and it seems to me a pretty well written piece of software with potential. I like the json style assignment. Will keep an eye on this.
I love K/Q and is using it in my startup. Thanks a lot for Kx's recent freeing up the 32bit version. To use APL-like languages I have to really shift the way of designing/modeling things. Most importantly K may not be best for lots of developers working on the same thing. Object oriented languages will fit better in that case. K projects often only involve one or two developers who model things in vector thinking (column based thinking in data domain), know exactly what to do and how to do it. Vector thinking is not suitable for all problems, but works really well if it does. Btw, new 3.2 version of kdb appears to be even faster than before. It also improves websocket integration and JSON data conversion. Very nice to integrate with nodejs/Qt.
We also use Forth which I think is a really another way of shifting mind.