Trawlr Ben has posted about his experience creating an iPhone optimised version of Trawlr with iUI and Rails 2.

He goes through the steps that he went through, which include:

• Mime type: Mime::Type.register_alias “text/html”, :iphone
• Detecting the iPhone: def iphone_user_agent?
• Store whether it should be adjusted for iPhone adjust_format_for_iphone
• Using iUI and creating iPhone views

Mr. TopFunky himself showed up to share his 80% solution for using layouts to generically support the iPhone without having to update views for each page:

layout :determine_layout

def determine_layout
  if mobile_safari_subdomain_or_relevant_header?
    return "iphone"
  end

  return "application"
end