This is a brief video I uploaded to see if a movie rotated in QuickTime 7 Pro can appear on YouTube in vertical format. I took this video with my Nexus One upright (vertically) at the Sea Life Aquarium in Tempe at the Arizona Mills shopping mall. Looks like it worked! How to do this? Quoted from QuickTime 7 Pro help:

To resize or rotate a QuickTime movie:
In QuickTime Player 7, choose Window > Show Movie Properties.
In the Properties window, select a video track and click Visual Settings.
To resize the movie, type new numbers in the Current Size fields.
To keep the same height-to-width proportions, select Preserve Aspect Ratio.
To rotate the movie, click one of the rotate buttons.