• the difference between the 2.66Ghz and 2.4Ghz is minimal. 6 or 7 mins in a an hour's video encoding is about it. You'll notice no difference in everyday use.
• CS4 is a 2D software package, with some apps utilising the extra power of modern 3D cards. There will be no difference between the GeForce and the Radeon. Unless you're going to be playing games, you won't be using the extra horsepower of the GeForce at all in Photoshop!
Get the 2.4 and spend the extra money on another 2gigs of RAM.
AlexisV who posted the above post knows what hes talking about, why purchase a 2.4 macbook with small screen estate and an average screen? I think a person should purchase a computer/laptop based on there needs. Whats the use of a top notch graphic card if you arent playing video games or using graphic extensive applications?