An update on Uruguay's deployment of olpc in high schools: Plan Ceibal has posted some details and images of the laptops that will be used in this project. Some schools will use the new blue XO-HS laptops, and others will use Magellans -- the only implementation of the Classmate design that has been used in large scale deployments (in Portugal and Venezuela).
You can see their take on a feature comparison of the machines. While there's no check box for "sunlight-readable screen", robustness, or power management, it's a good look at how schools perceive their options. I would be glad to see classrooms worldwide adopting any platform like this -- both can share the same software and materials.3