I've owned this laptop for about a month and it is easily the most versatile, reliable and best looking laptop I have ever had. The Macbook's design is beautiful. The case is durable, and the keyboard is a joy to use. The trackpad is really smooth and features Apple's multi-touch meaning a one finger tap is your standard left click and tapping with two fingers is your right click.
The Macbook also sports a built in microphone, webcam, Bluetooth, 2 USB ports, a Firewire 400, a Mini DVI port, Magsafe Power adapter, microphone and headphone slots and 802.11n WiFi- currently the fastest option available.
I really like the magnetic latch and the magsafe power adaptor features. It's not necessary to slide any levers or buttons to get the Macbook open, and of course the glowing apple logo on the front of the case is very cool.
The Macbook's operating system is faster, more reliable and easier to use than any version of Windows I've owned. It does take a good hour or so to get used to the new interface coming from Windows but once you do you'll be glad you switched. Everything is streamlined to a point that you can get to wherever you want in one or two clicks.
All your files like Word Documents, Excel and Powerpoint stuff can all be read by both iWork or Microsoft Office 2008 for Mac. So file compatibility is no issue.
All your stuff like your wireless network, email, printers etc. will work faster and more efficiently when on a Mac, so you need not worry about that.
Another advantage is the amount of free software you get bundled with the Mac. Powerful tools you can use right out of the box like iPhoto, iMovie, Garageband etc.
My Macbook gets around 4-5 hours battery life when working on Word documents with WiFi and Bluetooth turned off. Playing online and using graphic intensive processes like games etc. will cut the life to around 1-3 hours which is still very good for any laptop.
The Macbook is such a fantastic computer I really love it. If you're looking for a very reliable, easy to use, good looking computer the Macbook is a great choice.