What would be the point of wifi tethering? So their are no cables? Seems like overkill to me. You can connect to wifi hotspots if that is what you are trying to achieve?
Boy, I hope I get this right because there's nothing I hate more than being wrong when answering a question...
The main point of WiFi tethering is to effectively make your phone a moble hotspot allowing other devices (notebook, netbook, iPad, etc) see your phone as a new network, join that SID and connect to the internet via your phone's 3g data connection.
Did I get that right?