Nope. I only tip "personal services" people...waiter, hairdresser, nail tech, etc.
I did think about it once, though. Cable guy was here to do my phone (3 weeks after they did the cable and internet install) and I asked if he had the materials and time to hook up the cable outlet in our guest room while he was here (it wasn't done at the initial install). He said "Yep, but that'll run you another $24.95," and said it in a manner like he didn't want to do it. (Getting another appoinment would have been $29.95, though...their minimum charge....so I agreed to the price.) It took him about 30 seconds and since he wasn't very nice about it, he did not get a tip. Had he been nice about it (and I still paid) or if he had not charged for it since it took 30 seconds and no materials, I would have tipped him since he was going out of his way.