This is the presentation I gave for OpenTech 2010
If you're on mobile, you can view the mobile friendly version of the slides.
Here's the audio of the talk.
The gist of the talk is - more people have mobile web enabled phones than have iPhones or Androids. Open Data requires open access. If you are trying to create a service to serve people - make it work on all phones. Not just phones owned by a minority of rich people.