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Upgraded to Mandriva 2009 a week ago. Tried it on my EEEPC for a few days before I upgraded the main household PC/server.
Completely painless... new KDE 4.1 desktop , upgraded kernel, and a revamped Mandriva Control Center. Everything's a lot faster (see, with Linux upgrades things typically get faster not slower).
Only one issue: VMWare doesn't yet work with the new kernel (2.6.27) so I shifted over to Virtualbox for the one windows app I still use.
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http://www.mandriva.com/en/download