In Far Cry, the performance improvements ranged from 30fps to as little as 2fps, although at 1,280 x 1,024 resolution the gain was between 20-30fps, which makes it a viable upgrade path.
Acer is just one manufacturer vying for our attention amid the furore over the new netbooks, and it's hoping the Aspire 8920G will re-interest us in full-size laptops.