Hello,
I've uploaded the sources to the Vancouver.rb Rubyforge subversion repo for the mobile web application using the iUI library and Ruby on Rails 2.0 as shown at last week's Nitobi Hack Day.
Thanks to team Nitobi for the great event, sandwiches, beer and free books.
You can browse the sources online @ http://vanrb.rubyforge.org/svn/roomie/
An in-progess write-up titled "How To: Create a mobile web (iPhone) site using iUI and Ruby on Rails 2.0" resides @ http://rubybook.wordpress.com
Cheers.