I've just learned today (thanks to Craig!) that Microsoft has already created a spec for with a Wi-Fi wireless Smart Display very much like the rumored Apple iScreen I mentioned on Tuesday! These Smart Display products are already available from Philips, ViewSonic, Fujitsu, NEC and TG. Smart Screens start at around $1000 and are available in 10" and 15" screen sizes.
So, it should be interesting to see if Apple really does follow through with the iScreen idea or not. If so, they already have competition, though some of the other tidbits I've read at O'Grady's PowerPage and Mac Whispers since Tuesday seem to suggest an iScreen may be more like an iPod with color 8" screen than a larger 15" monitor. We shall see!