i’ve modified  to create a gui-less torrent downloader as i was searching for an issue with that example. my problem was that  worked nicely but my adaption of the torrent code did not.
it connected to the tracker and it reported that there was a peer but it did never find a seed.
a few hours later i found the solution to that problem: one has to initialize the upload/download rates (as the default value is 0).
anyway:  features a very minimal codebase which is very easy to adapt to your qt project.
update: i’ve already reported this issues at http://bugreports.qt.nokia.com