A serious vulnerability has been found in wireless encryption. The good news is the attacker has to be local to the network being attacked. That is if you can call this good news. Major vendors are already producing patches and end users should update their devices as soon as possible. And as always contact your IT professional for advice.
http://www.appy-geek.com/Web/ArticleWeb.aspx?regionid=1&articleid=118041131&source=wordpress