If I were you would I would do is take some time and signup for an Apple Developer's membership.
http://developer.apple.com/
They have a whole section devoted to designing sites and webapps for iPhone, almost all of it is very good with examples. Also if you are interested in really developing for iPhone the SDK will be released next week so you will want to snag that off of the developer site as well. As far as some quick simple things like getting the nav bar to go away, creating some iPhone specific links(google maps, address book, calling...) all that is outlined on the dev site.
Overall if you are just designing a page in general for iPhone just follow a quick set of guidelines:
- if it is iPhone only use the correct page sizes(found in the dev site)
- Create an iPhone webclip image(tells you all the specs in the dev site)
- For linking create large button links(for finger selections) and stay away from drop down menus
For the most part safari accurately renders everything, and even at far stricter standards than IE and Firefox. The only thing not supported yet is flash which should be coming in early March.