HDMI connections between your HD source may it be your DVD player or cable box. The beauty of it is, both audio and video in ONE cable!
Here is a website to check out and a good source to buy from if you ever compared prices. Beware of hype and $$$$!
http://www.pacificcable.com/HDMI_Tutorial.htm
I skip the Extended Warranty every time! That is where these stores make the most money!