So today, next to my MacBook, sits a 20" aluminum Penryn iMac. I bought it yesterday. It's the lowest end model but it will be good enough for me. The 20" screen is so much bigger than my MacBooks 13" screen. It just feels like there is more space to work with. Overall, I like the iMac. One thing though, I could hear a small fan-like noise near the screen. Is this normal? It's like a fan spinning at low speed noise.