I'm getting some D4 (ring finger) fingertip numbness from the DIP onwards, likely from using a desktop mouse too much. A wee bit in D2 (index finger). Looking for mouse alternatives. Will consider getting new keyboards - USB only (not a fan of replacing batteries in devices). I've bought two things already. http://www.ergonomictouchpad.com/ergonomic_touchpad.php and another USB Touchpad. Still looking for more alternatives. I've tried mousing with my opposite (left) hand. Learning to grab the mouse differently would probably help too. A different shaped mouse that won't enable me to put pressure on the mouse with the ring finger would help.