I looked into this, but price is definetly the limiting factor. You are definetly looking at $250+ (CDN) to get this up and running..
The most promising looks like Diamonds Home Free wireless ethernet cards. The Lucent 802.11 deal is nice, but its very expensive ($1500 CDN for a starter bundle)..
Apple's airport is a nice system too, but I'm not sure if you can get it to work with a PC, and its pretty expensive too.