IOGear offers an automatic HDMI switch with 4 ports.

The affordable HDMI switch is based on IOGEAR's patented HDAS (High-Definition Automatic Switch) technology, which instantly locks and transfers the active audio and video content to the connected HD display.

The two HDMI ports found on Plasma or LCD HDTVs just are not enough anymore with Sony PS3, Apple TV, HD-DVD Player, TiVo HD and HD Cable boxes in the living room.
The product is High-bandwidth Digital Content Protection (HDCP) compliant and supports 1080p resolution. LEDs on the front panel display the HDMI device that is currently in use.
The IOGEAR 4 port HDMI switch sell on Amazon.com for $155.99.