I upload anonymously, and never created an account, so I had no idea what was going on :P

I'll post a reply if I noticed that they changed something again.

Thanks for the suggestion!

PAR sounds like it could be useful.
My main wonder is, though, how necessary is it really? TCP is checksummed, so it should be able to detect transmission errors - corruption seems somewhat unlikely here.
Okay, AnonFiles is problematic, although they're a relatively rare case. Unfortunately as I'm using delta coding, a random bit flip will corrupt the rest of the file, so some redundancy probably won't be enough to fix it.
Even with the rare case of corruption, you could fix it via the torrent, as long as it still has peers. Torrents hash pieces, so it will be able to identify which pieces are bad and re-download good copies of these. PAR files, on the other hand, just seem to increase your chances of getting a good file, and may not work depending on how much corruption there is.

Another complexity factor is where to upload the PAR files to.
Is there much of a benefit with PAR files?