I just hit a snag with Win7 and my MSI Wind U100. The webcam doesn't work. It did with WinXP but not with Win7.
There is no driver available from the MSI website which says that the driver is included with Win7. I am able to install a driver through Windows Update but the driver doesn't work.
A quick Google search reveals that several other people have reported the issue like this thread in MS Answers.
So there you have it. If having a webcam is important to you, stay away from a Win7 and U100 combo.
While waiting for driver update, I will have to run Slax on a USB drive to use the webcam with Skype.