I briefly mentioned a demo app built within my team that integrates Outlook with Flickr (I think I mis-identified it as Facebook in the original post). It's in that category of apps that I'm not sure the "OBA" label fits but is more of a convenient mashup of Outlook and web services.

This was developed by Adam Wilson who is doing an internship on the VSTO team right now. It is pretty simple. First it extends the contact view in Outlook by adding an adjoining form region at the bottom of the contact view to associate a flickr user name with a contact.