GitMarks is a command-line based social bookmarking tool built on Git with Python. It's a script that grabs the content from a URL and stores in Git repository where it can be searched with GREP. It features tags and descriptions, and can import bookmarks from Delicious.
It seems like it could be useful for research teams, or to quickly dump lots of content in one place for future text mining.
Here's an example usage:
python gitmark.py -m 'ReadWriteWeb' -t web,hacking,tools,development http://readwriteweb.com
That would bookmark http://readwriteweb.com, with the description "ReadWriteWeb" and the tags "web, hacking, tools, development."