I recently installed the KDE4 version of Kubuntu on my laptop using the Wubi installer and was able to start using KWin's desktop effects on my laptop for the first time. I wasn't able to do so in the past because I didn't have a native install and VMware Player doesn't support hardware acceleration.
The Wubi installer was a great solution because it allowed me to install Kubuntu without disrupting my existing OS and also allows access to any existing files on the local hard drive.
After installing KDE4.1 beta 1 I started to get curious about battery life. I had heard that Vista's 3D desktop decreased battery life and wondered if KWin did the same.