New Features:

Clock sets/updates itself across the Internet
A barcode scanner pulls cooking instructions from an online database. Such a database didn’t actually exist, so he’s building one himself, adding directions as he goes.
Voice Commands, like “Microwave, Twenty seconds, Low.” (Alas, Nathan says his kitchen’s acoustics screw this up a bit.)
Custom sound effects (because beeps are for chumps).
You can control the microwave from your phone. The only uses I can think of for this are: when you know you’ll want microwaved popcorn later and can preload a bag, or when you want to convince your friends that you’re the biggest geek on the planet because you have a microwave that you can control with your phone.
It tweets when it’s done cooking, because of course it does.

Check out Nathan's site here. madebynathan.com

And while we are talking about microwaves, check out this art created by microwaving objects on simple white plates before and after presented as animated gifs. ( via Microwhat )