Netsquared, an arm of the non-profit advisory site, Techsoup, just posted an email interview I did with them about tagging. At the end of the interview, I also listed up a few examples of how Yahoo applications can be stitched together and used by non-profits (and other small organizations) to organize and inform their community.
Thanks again for doing the interview, Ian. Looking forward to seeing any comments this might generate in the Net2 community.