I haven't seen this mentioned here so I thought I'd share. I am a big YouTube fan and always hated how low quality the videos looked on mobile. I have been using this modified version of the latest YouTube app for about a week and WOW do videos look amazing on the Triumph. Here is the link --> [MOD] YouTube APK with 720p HD playback (WiFi + 3G) - xda-developers
Unless your phone's screen has 720 resolution, your youtube videos will be displyed at it's native resolution, which is 480 on most phones.
No.
720p videos will be downscaled to your phone's screen which will give an even crispier image.
Plus 720p videos have higher bitrate, which means higher image quality/detail.
Anyone that doesn't believe that this mod actually improves quality, please try it and then hide.