Because I lost several trees to yellow-bellied sapsuckers, a kind of woodpecker, and watched my neighbor fight to keep woodpeckers from destroying his front door - he lost, I was very interested when I saw that Sophron Marketing has come up with an Attack Spider®
According to Sophron Marketing, The BIRDS-AWAY Attack Spider® is a battery-operated device that chases away damage-causing woodpeckers. Activated by sound, the spider drops down on an 18-inch string while making a loud noise. Then it climbs back up the string, ready to attack again. This unusual solution is both very inexpensive and highly effective. Woodpeckers cannot stand them!
I have not tried this spider - no nuisance woodpeckers around right now - and so I do not know if spiders really keep woodpeckers away. However, for those with problems, this product sounds intriguing.
The Birds-Away Attack Spider® web site is worth a visit for the animation; the testimonials are also great!