Your Desktop Anywhere? 21 Web-Based Desktops
Here's A Nice List of online desktop applications. Commonly called “WebOS”, “webtops”, or “web desktops”, these applications use Flash, Ajax, or other web technologies to mimic a regular, PC-based desktop. In theory, this means that wherever you went, you’d be able to access your work through a common interface and set of tools. All with a single login, too.