If you plan on getting serious about your photography, and want to get the most out of your post processing and prints without having to guess if you're colors are accurate and whether or not your prints are going to be too dark or too light as compared to what you see on your monitor, it is highly recommended that you calibrate it. With the tools available today, all the guesswork is taken out of it for you and the programs that come with the calibration tool (colorimeter) will step you through the process. Doing it will only take 15 - 20 minutes, and you will see a vast difference. If I didn't calibrate mine, everything would appear way too blue, and my prints would be dark as these new LCD monitors tend to be too bright. The first time I calibrated my brand new monitor (at the time) the difference was like night and day. Amazon has a good selection of calibration kits here
. You don't have to spend a fortune to get a decent one, either. I use a Spyder2 that I've had for a couple of years now and have been very satisfied with.