I'm going to break with Oren and suggest that you do get an external HD for the Macbook. The main reason is using the included Time Machine software on your laptop to backup your stuff. It backs up everything including your OS so if something really bad happens to the laptop you can pick right up where you left off when you replace it with a new laptop.





Along those lines I'd suggest the Iomega 1TB MiniMax... it's pre-formatted for Mac and is basically bulletproof. B&H has them for $118 right now.