I don't know anythink about the YouTube HD app but the basic Youtube app allow to see in "normal quality" and "high quality".
I'm not sure that the HTC Magic is capable of playing 1280x720 video ... on his 480x320 screen.
I got this app from my HTC Magic HK Version, it can see youTube HD!! How can i install this apk in Hero Rom~~
Copy the *.apk to your sd-card and open the file with ASTRO. ASTRO is a free application that can be found on Market. This application can do much more that just install applications from a file (apk), it's recomended to have this app
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