Organizing Shared Libraries of Articles

I'm trying to figure out the best way for a group of people to share libraries of articles.  It'd be nice if each user had some ability to adjust it to their style, and it's probably important to make it really hard for anyone to Jar-Jar the whole thing.  Also, it'd be cool if it was integrated with some citation software, and maybe a useful note-taking system (NVivo or Atlas, or maybe just PDF annotations?).

So here's things I want to remember to look into:

• Zotero group libraries - are attached PDF's easily downloadable?
• Scripts
• It'd be easy to make one to periodically copy items from Dropbox folders to whatever each user prefers to use (but that'd be easy to Jar-Jar).
• I think there's also ways to use an Endnote library to rename files in a given format, like "Author (year) - title."  That'd make it easy to incorporate everyone's folders after they depart.
• Endnote Web
• Google Reader
• Binders with printed articles

UPDATE - 09-01-11

I just saw this on a Mendeley feedback forum:

Mendeley's database is a SQLite file and you can export your library with file attachment links to Bibtex, RIS and EndNote XML and other projects have built tools that can interoperate with them.

Making use of these export facilities, one way to get metadata from Mendeley Desktop into PDF files as XMP metadata is as follows:

1. Select documents in Mendeley Desktop and go to File -> Export. 

2. Choose 'Bibtex' as the file type 

3. Open the Bibtex file in JabRef 

4. Go to 'Tools -> Write XMP Metadata to PDFs'

See http://jabref.sourceforge.net/help/XMPHelp.php for more details.

Be aware that if you are syncing files with Mendeley Web these changes to the PDF files will not be mirrored to other PCs.

so maybe that's something to try.