Here are some typefaces designed specifically to be read from the screen and some links to web specific fonts.
Mircosoft will ship five new typefaces with the new version of the Windows OS sometime in 2006. These typefaces were commissioned and designed specifically to ease reading from screen. The new OS called Vista will also have an new UI font called Segoe.
Ascender has designed custom fonts for the Xbox 360. Check out the Convection custom typeface family here.