I'm having trouble figuring out what to buy, though. I know the general setup I want: a router, a card for a laptop, and a card for Heather's desktop PC. Eventually, I'll want to move the desktop to another room and put a card in that too.
Kevin has given me some recommendations for router and laptop cards, which I'm terribly grateful for.
But I'm having trouble deciding among desktop wireless adapters. I even had substantial trouble figuring out that the general category of products I'm looking for is called "Wireless PCI adapter" or "Wireless USB adapter". (PCMCIA has apparently changed to being called 'PC Card', which threw me off for quite a while.)
It's pricey enough that I fear getting stuck with a lemon. But I'm clueless that I'm having trouble sorting things out.
Ah well. It'll all work out.