I have 1gb of ram in my macbook as it currently stands, however, I've been looking to update it to 4g which is 100$. But me personally am not sure If i need that much, so i was thinking about just ordering 2 gb which is 50$. I need help deciding. I am a big internet user, and multi-tasker. I will have itunes, mail, ichat, and firefox open 90 percent of the time, while working on a word/pages document. And I have an external monitor if that matters. So i've never dabbled in RAM before So i'm asking you guys if you think I need 4 or 2 gigs of RAM, and yes my blackbook can hold 4gb. And thank you so much for your posts.