That more pixels on the screen can cause people to return the laptops. Many owners can't dive into windows to push the display font sizes up and end up with tiny screen fonts. After suffering many returned laptops, it's good to read the makers have learned the lesson.

As to the GHz rating, you may have missed an article about how the Centrino executes about twice as many instructions at the same clock rate. Hence the clock rate can be lower, give more performance and ... give better battery times.