Exactly johnzap- HD has no meaning any more. The term is so overused and misused it has become really annoying.
It's the same as when the iPod took off. All of a sudden- everyone that markets something - they have to put the little "i" in front of it.
Here is the ultimate insult - I just Googled iHD and got this:
YouTube - Yes Man - Trailer in iHD™
WTF is iHD? WHO CARES!?!
We need some specifications and we need to stop all this misleading marketing.