To switch from Gmail to Google Calendar, you'll click on the navigation bar and open a new window or tab. While you can always resize the windows and keep both Gmail and Google Calendar visible, it would be nice if iGoogle provided a way to freely move the gadgets inside the window, like in yourminis.com.
With the addition of Google Desktop gadgets and the customizable layouts, the personalized homepage could really replace your desktop. But gadgets need to be more powerful and offer more than a list of links. Ideally, the Gmail gadget should have an expanded version that lets you read messages, compose mail and search inside the archive.
Max designed a small proof-of-concept that groups many of Google's web applications. "I think that it would be a good idea for Google to group all of the online applications in to a single web application. Something like an eDesktop," he writes at Google Groups.
Max's vision for a Google eDesktop. Click to enlarge.