Hmmm, I must really be paranoid ... we are running Zone Alarm, plus other programs for firewall and virus protection, have a router, have utility power & phone line transient voltage surge suppression and still, the standing rule in the "Lighthouse" is that the DSL & PC power lines are unplugged when not in use. Moving to DSL did help as there is some fiber optic distribution involved, but it is still copper into the house.
YMMV due to different weather conditions, infrastructure and power generation / distribution systems.
Actually not paranoid, just tired of replacing equipment due to power induced computer problems. All of our immediate power and phone lines are overhead, between the poles getting hit by cars which sometimes causes high voltage power lines to contact low voltage communication lines, and the occassional lightning induced events, it has been much less expensive to simply unplug. /ubbthreads/images/graemlins/icon23.gif
The unplugging also reduces the overall exposure to hacking and hijacking of our computers since they are turned off and disconected.
Bottom line, once bit, twice shy. /ubbthreads/images/graemlins/ohgeez.gif