WEB OS RUNDOWN: 45 Web Operating SystemsFacebook wants to be the operating system for the web, it says, and this week's changes to its email system are a tiny part of that puzzle. But there are many more web operating systems hoping to bring all your usual desktop applications online in one place. Some replicate the entire desktop, while others are startpages with info from around the web - here are more than 45 of our favorites. Remote
