It is funny, in the past the subject of color management has not really come up. However now it seems to be coming up all the time. I do a job for a client and they call or email and tell me that the colors does not match what they expect they should look like. When I ask them what they are viewing it on it is usually a laptop and sometimes a desktop system. When I asked if they have any type of calibration for their screen they simply have not idea what I am talking about. Now in the business of customer service the old adage, "The customer is always right" needs to be completely thrown out. In this case never has the customer been so wrong and I have to admit it is not easy telling them what they are looking at is not what the image really looks like. My monitors are generally all calibrated. At least the monitors that I use for image editing. I find most laptops are close at best, and the Mac's are better than the pc laptops. However I would not judge a final job on it, unless there was absolutely no other choice. So the important tip of the day, learn how to calibrate your monitor. If you have to call in someone else to do it for you because it is total voodoo science than do. It makes the workflow from Photographer to Client so much smoother. Also beware that the ambient (existing) lighting in the room you are doing your image editing, or viewing will have an influence on the accuracy of the image as well. One last little tip- It is nearly impossible to get a dead on match- and that is debatable if it is truly dead on accurate because depending on how you output, ie: photo print, web, or 4 color press print- you will need to set up specific to device you are outputting to as well as their particular specifications. So the best thing you can do is be "pretty close"- but sometimes that might seem to be somewhat elusive.
I hope this was helpful-