Hey, I have a Blackbook, a little over a year, but am getting ready to purchase a new MBP. Trying to decide between the 13 inch and 15 inch. There's nothing wrong with the Blackbook, I am keeping it. However, I need a separate laptop for my business. The Blackbook will travel with me, and the other laptop for the most part will stay home. However, when on a business trip, I will take the MBP. The Blackbook will be used for everything (personal, work, etc.), and the MBP will be used for business purposes (contracts, etc.). 2 quick questions: 1. Can I use the same MobileMe account for both laptops. 2. I am leaning towards the 15 inch. Is portability a big difference than in the 13 inch, or will I not notice the difference? Thanks.