"iPhone enabled website" is just like any other website, except that it is designed for a smaller browser with a limited set of CSS/HTML capabilities. (Sort of like coding for IE6...)
But you are going about this in the wrong way. You shouldn't be asking for
iPhone support, you should be asking for
mobile support. Keep in mind that the iPhone only represents a fraction of the mobile market. - Granted, the iPhone is a bit ahead of the other mobiles, but they will soon catch up.
Bottom line: don't design specifically for the iPhone. Design your sites to work in the other mobiles first (Nokia and Blackberry lead the mobile market) and then
add the extra stuff for the iPhone. (Similar to how we sometimes use JavaScript in a normal browser. So that the site works without it, but works better with it.)
You may find this interesting.
(If you don't mind a bit of swearing...) QuirksBlog:The iPhone obsession