A good mobile mouse is essential for me to have a productive session with my laptop. I need a really small mouse that doesn’t take up much room in my bag. I have looked several times at mobile trackballs, you know those little handheld trackballs that can be used when you don’t have any desk space for a mouse. One of these would be very handy when traveling and you do not always have a lot of room to work with.The Perific Dual Mouse may be just the ticket to handle both cases I mentioned. It is an innovative little mouse that works just like other mobile sized mice but it also can be held totally in the hand and used as a trackball. Very nice idea. Looks like it’s only available in the UK but I could be wrong about that.