File this one under "it's so cool that you can't even buy it yet." Frustrating, yes. But as technology improves we can hopefully one day be able to see the exact moment our bagel is perfectly toasted.
The material is heated glass, which is currently being used in heated towel hangers and food warming shelves. One proposed invention using this material is a transparent toaster. This see-through toaster comes from the Inventables Concept Group , which has a huge collection of really cool design ideas. Check out their website to see what you might be using in the near future.