Ckeck out Windows Live: http://www.live.com/
What is Windows Live?
Your online world gets better when everything works simply and effortlessly together. That’s the basic idea behind Windows Live. So the things you care about – your friends, the latest information, your e-mails, powerful search, your PC files, everything – comes together in one place. This is a brand new Internet experience designed to put you in control. And this is just the beginning – you’ll see many more new services in the coming months.
So you got Hotmail, Feeds and a lot of Gadgets (Microsoft widgets) on a start page.
Great working AJAX stuff!