I have gone thoguh the page flakes it is a very good site which provide rss and feeds reading with the help of ajax.
The site has cool user interface and very easy navigation system. You can do lots of things on this site. You search the things using gooogle,ask,msn or yahoo. You have todo list. You have page layout editor which will create page layout very easily.
It also using webparts which is a great feature of Microsoft.NET 2.0 framework.