Document management systems

Okay, my head has offically been served on a platter.

You know if you don't get the wording right on a search engine, you won't get what you're looking for.  It takes a few tries, and some search engines have some filters to help with that.  Now...

There's "content management systems" and "document management systems".  You would think documents are content... but nooooooooooooo.  Content is more the data inside those documents, and thus opens the playing field to wiki's and Everything 2 and LiveJournal and such.  But I don't want that!  I just want to file a picture, slap a few tags on it saying furry, multilimbed, female, hyper, anime/manga, comic. That way I can filter down and not have to subcategorize much of anything.  I need a document management system, not a content management system.

My boss needs something similar, a document management system he can access from remote, classify them how he chooses, and be able to import massive amounts of files he has already.  And I'm drawing blanks on something that's off the shelf that isn't going to turn into another Wikipedia or PerlMonks site.  ARGH!

Any suggestions out there?