It's the Back To Basics microwave popcorn popper. Just a heavy plastic bowl to which you add a 1/3 cup popcorn, maybe drizzle a little oil (instructions say up to 2 tablespoons, I add none to maybe a teaspoon), and nuke for about 2.5 minutes. Results equal perfectly popped popcorn. Rinse off in the sink and you're done. Bought ours at the local Target for $10-$12 and if you eat a lot of bagged microwave popcorn you'll probably make your money back in a couple weeks. Even if you buy the gourmet popping corn, which really is better tasting.
Hmm, as of this writing, not available at Target.com.