Corporate Social Bookmarking Tools : eLearning Technology

I was just asked on twitter about using social bookmarking tools that work behind the firewall. I thought I had blogged about this before, but I'm not finding the post.

Here are the social bookmarking tools that I commonly cite in presentations:
BEA Pathways
Cogenz
Connectbeam
del.irio.us - perl based, very similar to del.icio.us
IBM Lotus Connections
Scuttle – Open Source
WSSsearch - SharePoint add-on
Any others? Good comparisons of these?

I originally included: Jive Software - because I thought they had it, but it appears they don't.