A few thoughts popped into my head while reading this:

The visualization of _aggregate_ urban sensing data may help offset some of the concerns about the negative impacts of such sensing so creatively - and disturbingly - envisioned in Chris Oakley’s brilliant short video “The Catalogue” (http://www.chrisoakley.com/the_catalogue.html).

The Seattle Post-Intelligencer had a report a few months ago about a bus driving under a bridge that was too short due to his [over]reliance on GPS navigation (http://seattlepi.nwsource.com/local/359497_bus18.html?source=rss).

Finally, you might want to consider embedding your slides directly into the post via SlideShare (http://www.slideshare.net - “YouTube for Powerpoint”). I started downloading your PDF when I started reading this post, and it’s still not done downloading (!). An embedded slideshare presentation would allow me to page through your slides right here on the page :-).