Richard Dudley has tweeted from an official Microsoft event that a killer feature of Windows Phone 7 is the free USB tethering, an option that costs extra with other smartphone platforms on most carriers, at least in the US.
According to Dudley, "Official Word — Windows Phone 7 will support USB tethering, carriers can NOT charge extra, above the data plan.”
Dudley then tweeted, "Correction to #WP7 tethering--that is not official, may not happen. I misunderstood a discussion. Tweet removed. My apologies."
In the past, Windows Mobile 5/6/6.1 supported tethering through the use of unofficial third-party apps, such as WMWiFiRouter.
If Windows Phone 7 includes USB Tethering, this will be a killer feature, and really get one up on other smartphone platforms. Heres hoping!