Maybe you saw the IBM announcement or the NY Times article on it. iPhone now can run iNotes, a lightweight application for access to Lotus Notes email, calendaring, and contacts.
But why the complex equation? Let me break it down for you:
IBM has no axe to grind with any mobile device (unlike Microsoft, who is required to promote Windows Mobile devices -- though we've seen a lot of iPhones on the Redmond campus lately). Therefore, it can afford to be device agnostic. The Armonk software giant has long supported BlackBerry, Nokia, and Windows Mobile devices. It now supports iPhone.
In other words, these iPhone owners are change agents. They see a benefit and want to go for it. We call this behavior of employee-led adoption "Technology Populism," and it's a force majeure. Here's one cool situation we heard from a client: demand for iPhone is so high that IT put up a wiki to encourage iPhone opportunists to comment on problems and solutions for iPhone in the enterprise. It's a "very active" wiki with 70 active participants. And this after only a month.