What OS to install in your netbook?

What OS to install in your netbook?
Typically, the popular OS pre-loaded in a netbook is either Windows (XP/Vista) or Linux. However, with more and more users dedicated to mod their new toy, thhere has been a wider range of selection.
Mac OS XA couple of months ago, MSI Wind U100 was reported to be capable to install Mac OS X. Ever since then, experiments for other netbooks were carried out, with different angle of success - some can't use webcam, and some with bluetooth disabled.
Windows 7Windows 7, which supposedly is the new flagship of Windows family, is another viable solution. The user experience is less difficult than Vista. The trial download period of Windows 7 has expired, so users might as well find alternative methodss by yourself.
Please note that these version are unsuitable for SSD laptops due to large harddisk space required by the OS.