ergoBeads

I use the "keyboard support" as an armrest. It is much more comfortable than those gel ones. Here's what PC Magazine has to say:

The IMAK ergoBeads stress-relieving products, designed by an orthopedic and hand surgeon, are some of the most comfortable we've tried. The IMAK ergoBeads Keyboard Support cushions you, conforming to your changing wrist positions. The IMAK ergoBeads Smart Glove (available in four sizes) has a removable splint to prevent your wrist from bending too much and has ergoBeads in the palm area to protect the underside of your hand.

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