I use HJsplit to join the parts(and yeah, I make sure I have all the parts) and Azureus is what I use for torrents. I think dangermousie has the same problem with torrents, though not as bad.

and...through killing with this pretty(except icons) as I'm finished and have posted about 80-90% of the pics I have, anyway(only unusable or extremely spoilery pics haven't made it to these posts)