I've kicked the tires on dspace and really like the tool.
The question that has been raised at my organization is:
Can dspace offer the check-out functionality seen in source control
A user if they wanted to work on the document - say a requirements
document - could checkout the document and it would not be available
for view by anybody else - they would then check it back in once their
work was complete.
I quickly scanned the archives of this mailing list and did not find
anything that readily addresses this point.