What is the difference between DVI and HDMI? I bought a plasma HD TV last year which has a DVI input, but I now notice that newer sets have an HDMI input. I don't use HDTV yet, but I was hoping to move to HDTV in the future as the format grows. Is my 1 year old set already out of date because I don't have HDMI? In reading the glossary here, it says that HDMI is "backwards compatible with DVI". Does that mean I'm OK for future HD viewing, either with HDTV or HD-DVD or Blu-ray?