I've been using
Picasa, another free program which does the same thing except the pieces are jpg files instead of pdf files. I tape the back with masking tape and have tried the front with clear tape and also gluing the front with a glue stick. I usually use the text option in a photo application then use Picasa to "posterize" it into sections. I have a bunch of old thin plastic campaign signs I use for backing.
These two signs below have clear tape on the front and are two sides of the same sign (I always use both sides!) :
(Above) I got the image on the left from FReeper
davidlachnicht
This one below has glue instead of tape on the front: