I've also moved to transcoding things into MP4/H264/AC3 as it makes pushing better. I'm starting to re-evaluate this decision, however. Many new set top boxes - specifically blu ray players - say they only support MP4/H264/AAC. My understanding is that AC3 in an MP4 container is kind of non-standard. It wasn't until relatively recently that my PS3 supported this combination. The problem is that there is no real alternative. AAC audio is a bit of a compromise, and other formats eliminate the tivo advantage. So I guess for no I'll stay where I am. I'm hoping that the blu-ray vendors eventually support the format with their streaming and then I can have the best of both worlds.