I did it: http://www.bitlet.org
Even if the CDN people don't like this, half the torrent sites out there would be better served if they had a tool like yours for quick downloads of the torrent.
I'd really focus on selling the improved user experience side, though. Ideally the end user doesn't even know that a .torrent is involved in the download. It's just another background/confusing aspect that users don't need to see.
I think companies will need a way to configure a fallback option for when BT isn't working for the user, but I think that's all just features that could eventually be worked into the mix pretty well.