Features a nifty little application that allows you to install multiple versions of Internet Explorer on a single computer, which comes in handy for web developers.
For computers that you may not have in front of you but want to test in terms of website usability, use browsershots.org to generate screenshots to verify that the sites appear correctly.
MSN Live Search shows a lot of promise with the new linkfromdomain operator.
Windows Live Mail Beta seems promising, but it lacks some important features that need addressing. Microsoft has not replied to any emails.
Giving users access to application API encourages creative projects. With Yahoo! Mail’s code being released, we can only expect more of this.