I'm also an iPhone user and use it to go to the web ALOT for both by jobs (investigator/consultant and photography).
The 2 biggest problems with viewing the web on an iphone (or other mobile devices) are: Flash & Screen Real Estate.
Yes Flash does offer some security for images, but at a trade off of excluding a increasingly larger set of the browser set (like mobile & some corporations), and has alot of security issues for malware/viruses.
With Screen Real Estate there is little you can do unless you go for a minimalism aspect.
All you can really do when building a site is avoid overly busy real estate and avoid flash. That's what I have started doing in my redesigns.
I just redid
Steel-sun.com and one of my main goals was to make it viewable on an iPhone and to have the Galleries viewable.