A couple of weeks ago, I read an interesting article about Ekahau Heat Mapper through my RSS subscription to Lifehacker (article here). Ekahau offers a range of features depending on the version you choose (from Free to Survey professional). From their website, the primary features are listed as: "Ever wondered how far your wireless goes, or how far do the neighbouring wireless networks extend to? Ekahau HeatMapper will display the coverage area of all the access points in the .....