OiNK, which is one of the most popular torrent sites out there (primarily for music) is letting all its users download as much as they want over the holiday season. Normally, they'd have to maintain an download/upload ratio greater than or equal to 0.5 (else they'd get castrated, drawn, quartered and fed to the dogs), but it's a free for all at the moment. To quote:
Between the 22nd of December and the 1st of January GMT (inclusive), downloading will not adversely affect your share ratio.
We will still be recording uploaded amounts, but ignoring downloaded.