I'd like a client that did that. Like when I'm downloading an albums worth of music, I can listen to the half finished MP3s...except you'll have the first 10 seconds of the song, then it skips to 5 seconds in the middle, then skips again...etc until the file just ends.
Even just a way to set the order in which to download files within a torrent. uTorrent has low, medium, high, and skip priorities, but I don't think you can set it to download the files in a specific order. That would be useful...esp right now. I'm downloading the Doom Remix album in FLAC. I'd have the first handful of tracks done and ready to listen to if it was downloading in order...what I have is every track has little bits of it done.
Ok...so off topic there a bit. For video? I wonder if thats what that Joost project is doing. Supposed to be some BT video thing. I suppose it would be pretty useful for any site that wants to offer HD res videos without going broke on bandwidth, while still allowing streaming.