Streaming is an absolutely essential feature of uTorrent and is the only reason to still use it (well, maybe not after the scene shifted away from XVID and to mp4). Let's spare the discussion of whether or not it is healthy for the torrent; its plenty fine on torrents already well seeded.

Are there any other torrent apps that offer comparable streaming or front-loading of specific files. I've tried a couple abandoned open-source options but they were absolutely unusable.