If your projector or TV doesn't support HDMI, or if the only HDMI port on the display is already occupied, here's the best alternative I have found for attaching an AppleTV to it: Kanex ATV Pro
$35 from
B&H Video . (they have a LARGE selection of Macintosh/Computer/Video accessories at VERY low prices, worth browsing)
The same unit from the
Apple Store is $50
I discussed the problem with Apple and this was the best alternative they were aware of. Converters to Displayport or DVI are considerably more expensive.
(FWIW, a HDMI-to-Displayport cable
will not work, displayport can wire-map
TO hdmi, but not vice-versa, so you
will find those cables around, they just won't help you)