As more people use internet-enabled mobile phones, like the iPhone [1],
the demand for mobile-enabled websites grows. Everyone likes to have
their own information in their own hands, all the time. Creating these
different interfaces can be a lot of work, but Joe Hewitt [2] changed that on the iPhone front. The iUI User Interface Library [3] was spawned and has popped up all over the place since (most notably on Facebook [4]). The library just requires some simple HTML to create a very slick interface that mimics the iPhone interface.

Where was Drupal [5] in all this though?
There are a number of solutions for mobile-enabled Drupal websites, but
none of them worked so well with the iPhone. So, I hacked together a iUI Drupal Theme [6], stuck it on Rob Loach .Mobi [7], and was surprised with the result. Go ahead, try it out [8]! Aside from a few little things [9], it worked perfectly on the iPhone. Still needs lots of work, though.

So, if you want an iPhone-enabled version of your Drupal website, all you have to do is install the iUI Drupal Theme [10],
and then switch to the iUI theme when the user visits your
mobile-enabled website. You could do that by either a small hack in
settings.php, or one of the many modules out there that changes the
theme based on the user agent or the domain. Enjoy!