Some people like using mouse pads for comfort. When using a mouse, it is very easy for your wrist, hand, or arm to get stiff or sore.
With regards to what gaming keyboard is best for you, well again that depends on what you want out of it.
A USB Flash Drive, is also known as memory stick, thumb drive and jump drive. It is a pocket sized device which is traditionally the size of a regular lighter and capable of carrying HUGE amounts of digital data.