What is HDMI + Bravia Sync?

I was just looking up comparisons of the new upcoming 250GB PS3 to the other available models, and I saw that both the upcoming 250GB and the current 120GB have what they refer to as "HDMI + Bravia Sync."

I was just wondering if someone could explain what this is exactly? I have a Sony Bravia TV myself, so if that's what it refers to, what's it do?

Here's a link to the page in question: CLICK ME

Look at the 'A/V Output' Section about halfway down the page, and you'll see wha ti"m referring to.

Ahh.. excellent. Thank you kindly.