I was just thinking about this the other day. I currently have a WinMo phone, and have a couple movies on it, but rarely watch them (just in case of extreme boredom). However, I have converted them to 320x240, the screen size, to save space on the storage card. I was thinking with the Evo, i would start converting movies to the screen size, 800x480. But then i remembered about the hdmi output. While we don't yet know if it will support 720p or full 1080p, storing a full movie at either of those resolutions will take up a lot of space. Taking this phone to a friends house and being able to plug in and watch a HD movie will be sweet, but with storage being an issue, I may only put one full length HD movie on it for this purpose, and convert the rest to 800x480.
I thought 720p was down in stone. but I could be wrong.



(can't wait for wimax in LA and an EVO in my hand!!!)