oh, and I brought my blow dryer from Toronto, and some other electrical stuff, and I brought an adapter from 110 to 220V. You are not really going to look for such things in the first couple of days in Doha, but you will need them right away. Now, almost 6 years later I have all electrical and electronic items for 220V :)
Laptop isn't affected by voltage difference, so don't worry about it.