Same problem now also at {http,ftp}.us.debian.org?
W: Failed to fetch
bzip2:/var/lib/apt/lists/partial/ftp.us.debian.org_debian_dists_unstable_main_binary-i386_Packages Hash Sum mismatch
W: Failed to fetch
bzip2:/var/lib/apt/lists/partial/http.us.debian.org_debian_dists_unstable_main_source_Sources Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old
ones used instead.