I work for a web design brisbane company called Kintek. Interesting, however it still uses wincap which means its actually sniffing the LAN packets or ARP poisoning to see other users insecure data correct? Most websites dont re-direct you to https before asking you to login which basically means your login details are sent insecurely over the LAN before they get to the internet.
Theres a cool tool which lets you see all this already called Cain and Abel: http://www.oxid.it/cain.html
Using ARP poisioning you can actually man in the middle anyone on a LAN unless they use https or anti ARP poisoning tools.
The real security threat will probably come down to sniffing mobile phone 3G data. And I wonder whats possible in that realm. If you can send it you can receive it, and I doubt its encrypted well enough to prevent reading, especially when the Police want the ability to pick messages out of the airALA The Wire.
Beware the new TTY code!