The major problem with wireless networks is security. I had a friend over with a wireless enabled notebook and we were able to sniff my neighbour's network. We went wardriving in downtown Toronto once and picked up well over fifty open access points in the space of 4 or 5 blocks. For more information, see this tutorial by Plastic.

If you want to use wireless networking, be sure to encrypt all your communications. It may not keep the mob or the CIA out, but it would keep me out.