What excites me about this adapter is how it will allow me to select where my Mac audio is outputted to (the speakers connected to my Mac or the speakers on my HDTV) with just a click of the mouse in the system preferences.
I'm still using a first-generation 24 inch iMac but I'm planning on getting a new iMac probably soon after they come out, whenever that might be. My iMac and HDTV are in different rooms but they are on each side of the same wall. So what I'm planning on doing is drilling a small hole in that wall and connecting them with this adapter. This way whenever I want to watch some streaming content, surf the web, play some games, or do just about anything on my iMac I would then have the option of doing these things in the comfort of my living room on a screen that's twice the size of my iMac's if I choose. It would also be a better way to show off slideshows, videos, and so forth to visitors and friends. I already have an iPod touch 2G and an Airport express so I could use one of those air mouse apps as a controller. If really necessary I could buy a Bluetooth mouse and keyboard.
I realize that a Mac Mini is the most popular way to go for this kind of thing but doing it that way would cost quite a bit more and I really don't feel like having to maintain two computers. More importantly, I don't really know how much I'm going to use this option so therefore I look at this as an inexpensive way to try it out.
One final note. I'm disabled and would be unable to constantly unplug and plug in audio cables depending on whether I want to use my iMac by itself or go out into the living room and use it on the big screen HDTV. Therefore the advantage of being able to pick where the Mac audio is routed with a click of the mouse becomes obvious for me. Maybe there's another way to do this just as easily without this adapter but I don't know what it is.
I can't wait until I can do this!
-PN