The fiestastic web design looks really good and its always nice to know that other people think there is potential in the idea.
I feel its a good strategy to have an iPhone app before a website or other native apps
1) I have never said "check out this cool website" but I have said "checkout this cool app" like a million time
2) Its cost effective (for a start up) Running a server requires time, cost and energy where as distributing an app is easy.
3) You are just supporting 2 phones with 2 screen resolutions. It helps in delivering a good experience. You wont have a lot of users saying it does not work on my Sony Ericsson E10i Xperia Mini.
These are just my views and they should not mean anything :P. I am definitely not an expert.