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What my site has done is we use PHPBTTracker, remove the css so it uses the theme we have in place, and then wrote a simple php document that includes the upload form and stats into one table and then created a wrap using the tinycontent module, so we now have a Tracker link in the menu and the tracker shows up inside the site. To download torrents, we use the main download module, in which members upload their torrent file, create a description and screencap, which indexes them all nicely, and allows the person to then easily begin to seed.