Cory suggested to have an easy way to get a checksum printout of an entire 
directory. E.g.: 
http://download.services.openoffice.org/files/localized/ca/3.2.0/.sha1

It should be doable - at least if the "directory" hash is a hash of files' hashes, 
and not of their content. It would increase the work in creating hashes though - 
or the work for Apache to pull lots of data from the database before it can reply.

Either way, it would be a powerful feature, and it would be worth to put some 
thought into it.