I can confirm this running Feisty and using gnome-video-thumbnailer from
totem-gstreamer 2.18.1-0ubuntu3. I don't think this is actually a "bug",
meaning that nautilus&thumbnailer is doing what they are designed to do.

1. Azureus is loading a video file to a directory nautilus is watching. 
2. Nautilus notices "oh, the file changed, better create a thumbnail for it".
3. Thumbnailer runs, and usually even creates a thumbnail successfully (.avi 
needs only the beginning and the end to be viewable in sane players, and those 
are the parts azureus tries to fetch first).
4. Go back to step 2 because the file has already changed.

The end result is that while the file downloads nautilus continually
recreates the thumbnail wasting 100% of the CPU in the process (and this
shouldn't have anything to do with azureus, the same ought to happen
while downloading with any bittorrent client). Workaround is to download
to a directory which is not watched, but some fix to nautilus would be
nice, e.g., have some timeout before creating a new thumbnail for the
same, changed file. This is probably the same as as bug #56738.

-- 
nautilus uses 99% of cpu and responds very slowly
https://bugs.launchpad.net/bugs/82424
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