The Microsoft Message is that Windows 7 is less resource hungry compared to Vista and should also run nicely on lower end hardware like Atom powered Netbooks.
Instructions on how to install Windows 7 beta can be found here (Via OS News).
If you do not want to test Windows 7 beta yourself on a netbook, CNet has done it for you. The initial results show that Windows 7 beta runs on netbooks and performs well enough, albeit not astonishing.
More Windows 7 on netbook tests:
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