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