I usually don't post twice in the same day (or the same week, anymore), but here's something I wanted to bookmark, courtesy Debian Package of the Day:
Just what it says. It's akin to wget, except that you can apparently link to a torrent as well. I, uh, ahem, haven't tried it out yet, so no review on how well it works.
Unfortunately, it doesn't seem to be able to download an entire http directory tree.
Oh yeah: even though the package is called aria2, the utility itself is aria2c.