MeLabs released a new demo version with support for several more PIC series.

Demo version PIC MCU support:

12F683, 16F627(A), 16F628(A), 16F688, 16F690, 16F84(A), 16F870, 16F871,
16F872, 16F873(A), 16F874(A), 16F876(A), 16F877(A): Supported.

http://www.microengineeringlabs.com/...s/PBPDEMO3.EXE

You might be surprised at what you can do with even the demo.

We have a few simple robotics projects in our Micro-Bot projects section that
were done with the demo version http://www.rentron.com/Micro-Bot/index.htm

Build or buy yourself a decent programmer that can handle controllers supported
by the demo version, and you're off to the races. A good solid device programmer
is worth its weight in gold. You'll see what I mean once you get started.

Nothing beats getting the full paid version at some point, but you can get a small
robot up & kicking around the house with the free PBP demo.

Last week we sold 2 complete development packages to a college student that made
the cash in his spare time, selling gadgets he made with the demo, to pay for
everything.