We've been a bit busy with all kinds of projects lately, but this popped up in Google+ today and looks like a really good idea - it's a homebrew pick and place machine, based on a CNC frame.
But the thing that caught our imagination was the tape advance method.
The head simply drops into one of the tractor tracks on the side of the tape and pulls it along! No need for complicated electronic feeds or multiple steppers - just use the positioning head to pull the tape along to the correct place. A neat idea.
Hopefully it won't be too long before we get to try it on our own machine!