Just linking to the original post and some of the responses for my own memory.

• blyberg.net » AADL.org Goes Social
• the goblin in the library » Sucking the Suck out of OPACs
• LibrarianInBlack: AADL goes social
• Superpatron – Friends of the Library, for the net: Ann Arbor District Library adds patron tagging, rating of items
• SOPAC, 4 days later

Now excuse me while I clean up the drool.