This would be an awesome idea, but needs some process to ensure that it doesn't take too much human intervention (zipping things up every so often). If the uncompressed directories followed a strict naming convention I could write a quick script to do it, but they don't, which means it might take some actual thinking, and I have too much stuff due to do actual thinking on anything else.
(Aren't I wonderful? Volunteering to fix the trivial problem if someone else fixes a much nastier one? )
Failure: when your best just isn't good enough.