Serving the hashes by appending the corresponding file suffix, like .md5, could
shadow existing .md5 files; likewise for sha1 files. But I think it would still be
worthwhile and it wouldn't matter at all.
MirrorBrain could become a "hash server": Whenever a suffix like ".md5" or
"sha256" is appended to an URL, MirrorBrain could return the corresponding hash.
Would be really cool.
Easy to implement, once issue 40 is done.