Ask HN: What staging/digital asset management solutions do you use?

I work as a graphic designer at an agency, and we produce a lot of JPGs, GIFs, microsites and flash files that need to be reviewed by clients before we can package them up and get them sent off. Currently, we use a very simple PERL-based staging site where we can upload files (including zipped versions that get extracted upon upload), but it doesn't do a very good job of managing/versioning the huge number of files we upload.

What solutions do you use for staging and showing proofs to clients? Any suggestions?