REVGRIDDLER This is the sort of program that you get so used to you forget what life was like before it. I do a lot of downloading, and Hazel quietly puts away all my stuff where it's supposed to go. I have it automating my torrent downloading, digital camera uploads, and basic file arrangement for me, all in the background where I don't even need to think about it. The "housekeeper" metaphor is truly apt, it's like I can just leave my stuff around and it comes in after me and puts it all where it's supposed to be.
If this weren't enough, the developer is incredibly cheerful and helpful if you have any problems (the background processes, at least as of 1.x, could get a little wonky here and there).
I recommend it anybody.
(Version 2.0)