WiFi certainly is very useful. I can now get a connection up in my room without having to lay 100ft of cable.
Also if I am somewhere else in the house and I need to do some research off the net, I just grab the nearest working laptop, and bing* there it is.
I do have WEP enabled on my WiFi network, but its amazing how many people do not. Whilst I had the laptop out on the train, I managed to get unprotected connections to two other laptops on the train.
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