"On private torrent sites, everything revolves around ratios. A 1:1 ratio (or 1.0) means that you’ve downloaded exactly the same amount of data as you’ve uploaded. Thus a 0.80 ratio indicates that you’ve uploaded less than you’ve downloaded, which is hurtful to the health of the torrent. Inversely, a 3.0 ratio means you’ve uploaded 3 times more data than you’ve downloaded. Strive to achieve at least a 1.0 ratio - each site will have specific consequences for members who maintain a ratio of less than this. Attain a ratio over 1.0 and the rewards shall follow you into the P2P afterlife."
[via Torrent Freak]