With Windows 7 RC expiring in March, people who were using the RC will have to upgrade to RTM version. But in case you have not still used the new Windows 7, here is a demo website by Microsoft to test drive Windows 7 features. This website offers a very simple way to test drive the new features of Windows 7 before you buy it. You need to run the website in IE6 + with JavaScript turned on and also install an ActiveX control from Microsoft.
There are videos and documents available to refer the features in Windows 7. Users can experience Windows 7 Professional in a fully-functioning environment, without having to install the full version. Initially the set up might take few minutes and after that you can test drive the features.