Use one of those old mouse pads sitting around your house as a 'coffee cup mat' placed by your computer. Perfect size, saves the wood desk, soaks up any coffee it there's any on the bottom of your cup, can be re-washed, and just works like a charm.
By CDC from FL
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My mousepad was is sad condition. It showed multiple spill spots, and had peeled up from all four corners. I considered buying a new one. But of course I had to try and use what I had first.
I thought my mousepad was worn out and ready to be replaced, until I got the idea of cleaning it with a piece of masking tape. I rolled the masking tape inside out, around my fingers, and proceeded to use the sticky side to pick up lint. Now the mousepad is good as new!