I have Sky hd box connected to Sony tv, but would like to be able to connect it to Themescene H30A projector as well, is there a switchbox which outputs two hdmi signals, or is there any other way?
Good luck, don't forget though that the sky HD outputs both HDMI and Component at the same time, so you could connect HDMI to either screen 1 or 2 and, component to the other.
Assume you have av sound so only need the one audio connection which you probably already have
If I were you I'd use the Components for the PJ and the HDMI for the TV. The components produce an excellent picture on my 720p DLP projector - indistinguishable from the HDMI (I've tried both). Save yourself a few quid and no need to take up yet another mains socket with a transformer to power an HDMI splitter box.