Here's a method adopted from a thread at my friends on Audiokarma.org.

Dehusk and rinse. Wrap in a paper towel and wet the whole towel, then lightly twist / squeeze out excess water. Lay each cob onto a paper plate or microwaveable plate. Orient ends in side to side direction.

Microwave for 70-80 seconds per cob on plate (1 min, 20 seconds or so). When done, rotate cobs 180 degrees (turn them over) and then turn plate 90 degrees (now ends front to back), and repeat microwave cooking 70-80 seconds per cob on plate.

This way, 2 cobs take about 5 minutes, 4 cobs take about 10 minutes. Times may vary with the power of your microwave so some experimentation will be needed.

Be careful, the corn and paper towel will be HOT when removed so give them some minutes to cool or place at table prior to the other courses.

White sweet corn seems to cook best using this method. I don't eat much yellow corn anymore so haven't tried cooking that with this method.

Good thread and good luck!