I am new to this forum and I am really concidering buying a MB in the next few months. I am fed up with windows and need to replace a dying Toshiba laptop. As I have been researching these threads I hear a lot about the new Santa Rosa MB laptops. Although I am computer friendly, I do not consider myself an expert, esp on Macs. What is the difference between the old MB's and the Santa Rosa ones? Sorry if this seems stupid, I just want to make sure I research before I buy. Thank you!