MacWorld has a brief review of a couple of HDMI switches – one from Iogear and one from XtremeMac. Functionally they sound about the same, here’s a quote from the article:
Both products work similarly, and perform a simple function. The Iogear 4 Port Switch includes a single button on the front for cycling through input sources. You can also change ports with the included remote control; it allows you to choose inputs directly (by pressing the input number) or by using Up and Down buttons. Blue lights across the face of the box indicate which port is currently active. It’s not easy to distinguish, say, light 2 from light 3 at a glance in a dark room, but at least your TV’s picture provides a hint.
XtremeMac’s Xtreme HD is unique in that it’s the same size, shape, and overall design as an Apple TV, so you can stack the latter on top of the former for a neater AV cabinet. Easy-to-read lighted numbers on the front of the box indicate the active input. Like the Iogear switch, the Xtreme HD includes a remote control with numbered buttons for each port; on the other hand, it doesn’t provide Up/Down buttons. It too includes a button on the front (labeled “Source”) for switching input sources.
With many HD sets having at most 2 HDMI inputs more is always better. Both of the switches in the review are over $100 though… Too bad they didn’t include some of the nifty cheap switches at Monoprice.