iPhone user research examples?

Hello IXDA folks,

I'm interested in connecting with iPhone app designers who have done
upfront user research or usability testing for their apps. Upfront
user research could include a variety of methods -- field studies,
interviews, surveys. The research doesn't have to be formal--quick-
and-dirty studies are also of interest.

I'd like to include your stories for an iPhone design book I'm working
on. If you're interested in chatting, feel free to email me at: suzanne at ginsburg-design.com

Thanks!
Suzanne

work: http://www.ginsburg-design.com
blog: http://www.iphoneuxreviews.com/
twitter: http://twitter.com/suzanneginsburg