Spot the similarity?*
The use of Ajax in Windows Live is what makes the user experience so appalling.
Search for "usability"
click on the first result to view the page
click the back button to return to the search results
And lose all of your search results. If Microsoft think that this nightmare of an experience is their path to future success then they need to start talking to their own usability people rather than swallowing too much Web 2.0 hype.
*They both break your back button.
Ajax Mistakes : Breaking the back button (May 2005)
Flash Usability : (Digital Web - January 2002)
Top-10 New Mistakes of Web Design (Alertbox - May 1999) : 1. Breaking the Back Button