Oh I forgot it also has PDF export, so I can print things out before milling them to check dimensions and obivous errors.
ALso I wrote this bridge to the EAGLE PCB program, so I can mill prototypes of circuit boards before assembling them to check if the mechanics fit. some examples here: http://bl0rg.net/~manuel/holzproto.jpg http://bl0rg.net/~manuel/holzproto2.jpg
Also it allows me to driectly mill the frontplate out of the eagle schematic, so I don't need to have a separate CAD file, and I'm always sure the buttons and frontplate and holes and screws will align perfectly. It also allows me for example to mill a complete guitar pedal (with PCB milling and fronplate and casing) in one go
Furthermore, I use a lot of those functions I built to actually generate different forms and monsters and graphics, some of which you can see here http://bl0rg.net/~manuel/abspack-crowd/ (that's the processing script), and that's the boards and wooden pieces:
Here's a picture of my device casing (first engraving test, ws not really good, but I got it now):