rsync-ing compressed archives

[Mauro Condarelli]

Hi there!
I'm quite happily using rsync.
There is only one case where I couldn't figure out how to use it
efficently:
I sometimes have large compressed files (either .tar.gz or .zip) that
I need to keep synchronized. The exploded files are usually not
available on the machines i use for rsync (to keep everything unpacked
would mean wasting a lot of space on the server).
The problem is that even if I change slightly the content of the
archive (just add a file) the compressed form will be almost
completely different making rsync algorythm practically useless.
Is there any easy way to tell the daemon to unpack (or just
uncompress) a compressed archive before doing the matching?
The problem is not severe with .zip archives, but .gz and .bz2 are
really inefficient.

Thanks in advance for any hint
Mauro