So you are looking for a mouse that you can conveniently take anywhere to get work done on your computer? The Padrone Ring is worth a look. It is a wearable Bluetooth mouse that connects to your PC, Mac, and any Bluetooth enabled device. Once you wear it, you can use your index finger on any flat surface to start moving the cursor.
You can tap with your index finger for a left click or with your middle finger for a right click. The Padrone Ring lasts about a working day on battery. It is expected to ship in July. More info is available here.