Trackball vs. Mouse. How about both.

Working at a computer all day can be tiring and potentially lead to repetitive stress injury's. Using a combination of two different input devises can go a long way to remedying this problem. I for one use both a trackball located to the left of my keyboard and a mouse on my desk to my right. Constantly switching up during the day keeps my hands from getting tired and cramped. If you are only used to working a mouse with your one hand try switching it over to your other hand from time to time or put a trackball next to it. Another option for some would be the use of a pen tablet. Next time you find your mouse hand getting tied give it a try.