Located on the back, is a healthy selection of inputs and connectors.
Starting from the left, are three HDMI 1.4a inputs (consider HDMI 1.4a necessary for Blu-ray 3D). I've always asked manufacturers for a third connector, for those who don't want to rely on AV receivers or external switch boxes to handle the load. Today, having 3 HDMI sources is common among users (ex: cable/satellite, Blu-ray/DVD, game machine). Kudos to Panasonic for that 3rd one. Three is pretty rare, except on more expensive projectors with expensive external processor boxes.
Moving to the right, next comes a pair of HD15 connectors. The top one is your standard analog computer input, and below it, a Serial port for command and control.
Next over is component video (with three color coded RCA connectors).
S-video (DIN connector) and composite video (yellow RCA jack) come next.
Then come two small jacks for screen trigger, and for 3D shutter out, (for an external, and optional IR transmitter should you need more coverage for the 3D glasses, such as in a large room).
That's all for the back, folks, except of course, for the power receptacle, Kensington lock slot, and master power switch.