HDMI signals cannot simply be split like old school coax cable can. What you need is called an HDMI Switch. It's a small box/device that handles multiple HDMI devices when you run out of inputs into your TV.
Here is an a example.
http://www.monoprice.com/Product?c_id=101&cp_id=10110&cs_id=1011002&p_id=4088&seq=1&format=2
"4x1", as this switch happens to be, will leave you with one extra HDMI input. You may not ever need the extra input, but I bet you never thought you'd have 4 HDMI devices

You can get a "3x1" and use up all your inputs but the cost for an extra input is minimal.
Your other option is to buy a home theater receiver, but that can get expensive. And based on your original email, I'm assuming not the road you want to go down.
Any questions, feel free to ask.
Merry Christmas and thanks for the BYard!