Wireless security and Linux
If you are looking for a cheap and secure wireless router setup, check out Tomato, DD-WRT, or OpenWrt.
I actually remember when I bought my first wireless network card. I was in Vancouver airport, and they were selling them for about US$ 200 with unlimited usage in the airport (as opposed to having to rent one for US$ 20 an hour). At that time, I was spending a lot of time in this airport, so I purchased a card and had a whopping 2Mbps (802.11a) of bandwidth to use while waiting. This purchase was quickly followed by a wireless router so I could enjoy the wireless goodness at home.