We are creating HTML5 web app for tablets ("tablet optimized" version of the web site).
Mobile domain names have already standardized itself to m.yourdomain.com or yourdomain.mobi. But how about tablet devices?
Tablet device in this context would be a touch screen device with min. 7" physical display, supporting features like HTML5 application cache and geolocation. The main thing is that the user can save the web app to the device main screen menu and have offline functionality.
(Naturally there will be automatic browser redirect per device class, but this does not remove the need of tablet specific domains which makes things easier).