Your mid-2010 13-17" MBP's *will* support HDMI audio/video (opens in new tab)

You could also skip the dongle, and just get a direct cable instead.

10ft, $45 - http://store.apple.com/us/product/H4637ZM/A?mco=MTY3ODQ5OTY

It does up to 1080p video and up to 5.1 audio for the following Macs:

- MacBook (Late 2010 release)

- MacBook Pro 13/15/17 inch (Mid 2010 release)

- iMac 21.5/27 inch

- MacBook Air 11/13 inch (Mid 2010 release)

- Mac Mini (Mid 2010 release)

- Mac Pro (Mid 2010 release)

get 3 of them for the same price here: http://www.meritline.com/mini-displayport-to-hdmi-adapter---...

When I was in my local Apple Store here in LA, I was confused that they didn't have any Apple Mini DisplayPort to HDMI adapters on the shelves at all.

Then I saw they had these instead. The Apple Store had the Moshi adapters completely take the place of the old Apple MDP/HDMI adapters.

That must be the ultimate coup for an accessory manufacturer: having the manufacturer drop their accessory for yours in their own stores!