The new Atom N450, D510, etc from the Pine Trail family do not support acceleration on the new flash player. Pine Trail CPUs have the GMA3150 and as far as I know it's not supported. The 32nm Atoms, or ION/ION2 are what you're looking for.
Some Pine Trail netbooks can take mini-pcie cards like the broadcom CrystalHD chip, which is supported by Flash 10.1.
edit: I see GMA 500 is supported. So the first-generation Atom netbooks should work.
Might be a dumb questions, but what's a 32nm Atom? Is it suppose to be coming anytime soon?
