Touch is a cute trick but for the most part I don't think it will make that big of a difference interface wise. In the end I suspect most users will use it every now and then on photos but it won't significantly change the user experience like it does on say an iPhone.<p>I made a post on my own blog not too long ago on why, after experimenting with touch interfaces, I found them to be lacking in a PC enviornment.
You can find it here if you're interested: <a href="http://www.tomstechblog.com/post/A-Quick-Indictment-Of-The-Finger.aspx" rel="nofollow">http://www.tomstechblog.com/post/A-Quick-Indictment-Of-The-F...</a><p>(I link only because there's one small graphic in the post that I think makes a big point and I couldn't embed the graphic here)