The Monster surge surpressor has a phone line and single-coax filter built-in. I had the phone line running through the Monster, so that's covered. The HD-TiVo has three coax inputs (two from the dish and one from the antenna). For those, the best story I can manage is that everything is externally grounded. The antenna and dish are wired directly to earth ground. Likewise, the coax outputs are run through filter blocks which, themselves, are also wired directly to earth ground. The grounding wire, itself, is something like 10ga solid core.

Also, it's weird that my router is busted, yet the DSL modem (an ancient Alcatel model) it's plugged into is working just fine, and is, in fact, how I'm sending this message.

My current theory, for what it's worth, is that the lightning must have struck near my house, and generated enough electrical noise to turn every wire in my house into an antenna. Some components appear to have fared better than others...