Security.
Don't forget to change the default passwords, switch on 128bit encryption and set the box to only talk just to your own wireless network card (MAC address control.)
If you do all that it shold take your local script kiddies at least 20mins before they can share your broadband connection.
Serioulsy, switch it on. I have just got a new lap top with Wifi, its a real surprise howmany people have wide open networks and that is without looking for them. *edit - ok it was no surprise...*
If you ever do need some tools to look for wireless access or to do a "security survey"
then have a look at
http://www.wardriving.com