From: Alton Brown
Hey, you can microwave-steam crab legs! Kelly told me about this, and I was totally skeptical and didn't want to ruin my expensive king crab legs. But, she convinced me to try it, and it totally worked. I really did not think microwaving seafood was a good idea - I thought it was going to turn out rubbery. It didn't! I put ours in for 1:45, because our microwave is really powerful and we always have to cut down on times in recipes. They were perfect.
6 Alaskan king crab claws, thawed
2 sprigs dill
If necessary in order to fit in microwave, cut claws at joints. Wrap 3 claws at a time in a damp paper towel, along with 1 sprig of dill, and then wrap in plastic wrap. Place wrapped claws in microwave 1 package at a time and cook on high for 2 minutes. Remove and unwrap carefully. Serve immediately.