Skype

Skype
Now that Skype offers software for your PDA phone, you can walk into a WiFi hotspot and make a call to anywhere in the world for FREE. Of course, this assumes that your phone is 802.11 enables, which is rare and even more unlikely, the person you want to call on another continent is also a Skype user. Of course, you can still save money by using their discounted service to call internationally to a real land line. However, give this a couple years when most phones will have 802.11 and hotspots are more ubiquituous--what will the cell phone companies do for revenue then?