The blog post is still accurate. Please don't do it.
Sending your BitTorrent traffic through the Tor network would overload it even more. It isn't designed to handle such things -- the Tor network has much less capacity than it has users wanting to use it. And since it's zero-sum, every person trying to BitTorrent over Tor means many more people in Syria who can't get to their Facebook pages.
We've even been exploring mechanisms for throttling "loud" users, to make it even less worthwhile to try to BitTorrent over Tor:
That said, it should be fine to just fetch the torrent files themselves over Tor. That's even what the Pirate Browser folks are trying to do. And it could even be OK to send the tracker traffic over Tor. The trouble there is that it's a slippery slope, and so far everybody who has made a check-box in their torrent software for just tracker traffic also makes a check-box right next to it for the bulk traffic. Since we don't want to get into the business of writing more usable (and more Tor-friendly) BitTorrent software, it's simplest just to tell people not to do it.
If you need alternatives, consider i2p, or
gnunet, or just getting a VPN somewhere.