I've recently bought a new laptop, and it is wide-screen. I didn't want it to be but they produce mostly wide-screen laptops now. At the beginning I was skeptical about this, but now I got used to and I can say it isn't any worse than a normal 4:3 screen (those screens now seem for me to be almost square
). I tested a number of games, and most of them can be switched to match the monitor's real resolution, so they are not stretched, and the rest of them are stretched by default, but in my graphic card's (nVIDIA) driver I found an option to lock the ratio so that the view just doesn't use the whole width of the screen. Or you can disable resizing completely, and then the image doesn't touch any side of the screen.
On the other hand, when viewing a text file, or writing code, I sometimes miss some height, while there's a lot of unused place on the right side. But you can put there the Start bar if you wish, or in IDEs like BDS you can use this place for Object Inspector or Project Manager, which I wouldnt put there on 3:4 because they would make the code less readable for me (I don't like narrow code editing fields).
So to sum up, if you already badly miss height, consider buying 4:3. Otherwise, I'd recomment wide-screen.