I think I am having some of the same problems as most of you. I had several movies I encoded using ripbot. 1024k bit rate 640x360 128 AAC audio. They played great on 1.4 of the iPhone 1. I updated to 2.0 and I want to say they were playing just fine on it for a few days. Now all of the sudden they just stopped working with the "movie format not supported".... I also have some podcasts on the iPhone, which those play just fine. I have a couple of home movies i had made and converted, same settings same program and THOSE still work ok... They are definately on my phone, I am not having a problem with that. They still play fine in iTunes as well. Just last night, my phone was acting strange too. It was like it was stuck in headphone mode. No audio would come out of the external speaker, except the ringer/alarm, no music would play out of the external speaker. However, if you actually plugged headphones in, that would be just fine. I would pull the headphone plug out, and adjust the volume from the home screen, and it would still say "headphones" on it. Just as well, when i was in the ipod with the headphones plugged in and listening, that was fine. then i would pause the music, go to the home screen and unplug the headphones and the music would START playing. just the opposite of what it should do. I left the phone on the cradle all night, it played some music for a while. when i woke up in the morning, it was acting normal again, except the video part. Weird??? the phone has never acted like this, has to be something with 2.0 upgrade i think.