another thing you can do with most models of routers (be careful with this), is to set security so that the MAC address (a long series of numbers and letters unique to each card, such as 00801a23bcb3..that sort of thing), are the only ones that can access the router.
In other words, you find the MAC address of each network card in the house, etc., and add those to a list. Just make sure you get them right, or you'll lock yourself out, and have to start over.
But the beauty of this is that (well, nothings' perfect) it should lock out almost everything. It's considered fairly high security. I'm sure there's something out on the web to allow you to find out the MAC address (they're printed on the card, usually, but I wouldn't want you to have to wield a screwdriver (I have a specialized program that does it for printers, but there's utilities for almost everything. Hope this doesn't scare anyone away..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)