On the guy who got his computer fried twice by lightning, does he have any connection between the computer and phone/cable/DSL lines? If so, I'd suggest checking that these communications lines have proper ground bonding back to the electrical ground system.
If you have two independent ground connections, then a nearby strike can cause current to flow from one ground electrode to the other, though any equipment that is common to both.
I saw an amazing example last year: telephone wire that showed lightning damage between two surface mounted boxes _inside_ a structure. The phone wire came in from a proper lightning arrestor box on the outside of the building, and the arrestor _was_ 'grounded' to a rod. The electrical system of the building had its own _separate_ grounding. There was no lightning damage to the wires outside of the building, nor any damage for several feet inside the building, and then a significant length of burned wire with spikes of copper poking out through the insulation where it had melted and followed the discharge path.
-Jon
