There are a host of new features in Ekahau Site Survey 7 and Ekahau have an up to date WIKI for you over at their site. If you want to know more, visit the link below.
http://docs.ekahau.com/index.php/What%27s_New_in_ESS_70
Ekahau Site Survey is available from MultiTask Computing. Email or call us for latest pricing and availability.