wondering the same thing. a little research seems to yeild that they are simialr, but hdmi the future and it is video and audio. for a monitor, i guess it wouldn't matter. i don't plan on using much audio on my monitor.
heres a thread that has some info in it on this, though it is tv angled.http://www.hdtvoice.com/voice/archive/index.php/t-10152.html