podcast resolution question

With help from the 'COW', my new video podcast (kitesites.com free kiteboarding video podcast) is listed in itunes and the Video plays fine and downloads on my ipod beautifully.

However, 37 Megabytes for 3 minutes of video seems like a large file size. Should I lower the resolution so it downloads faster? Before you answer, I still want it to look good on Apple TV. Apple's 'Podcaster Tech Specs' says that "Because it uses H.264 Main Profile, QuickTime Pro's "Movie to Apple TV" converter will result in a video that will not sync with the iPod." Is there a way to make my podcast available to ipod in it's native 640x480 while also making it available to Apple TV at 960 x 540? Should I post two versions? How do I do this?

Seeking wisdom from the cow once again

J Jordan
www.kitesites.com