Media Temple offers iPhone Account Center
If you're not familiar with Media Temple, here's their self-decription from their About page:
(mt) Media Temple, Inc. is an industry-leading, privately held, profitable web hosting and software application services company based in Los Angeles, California. Since 1998, our company has provided businesses worldwide with reliable, professional-class network environments to host websites, email, business applications, and other rich media content. We are a friendly, accessible group of "technology agnostic" engineers, support professionals, and business developers focused on the continued financial success of our company while adding value to the services we provide.
I particularly like the "technology agnostic" statement. It aligns well with my personal opinion that the tools we have to choose from today, – Windows, Mac OS, or Linux – are all highly evolved, mature, and useful. It comes down to personal preference, experience, and what kind of work (or play) you're interested in accomplishing.
What impresses me most about Account Center for the iPhone is how well the folks at (mt) have captured the touch screen experience. Out of all of the iPhone-focused web apps I've tried, this one looks and works most like the built-in applications on the device itself.