IMDB for ads

An online database that lists and cross-references actors from commercials. Then I could figure out how many spots that Asian dude from the current AT&T commercials has been in.

Email notifier

A way to see what someone's reaction/expression is when they read an email you've sent. And maybe how long they spent reading it and how many times they may have gone back to it later.

Sensor of humor

A way to tell by looking at someone whether they have a sense of humor and what kind (poop jokes, political, sarcasm, etc) so you know whether the hilarious story you're about to tell is going to go over like gangbusters or leave them shocked and/or disappointed.

Speaking of mattresses...

I would like one that always had a cool spot. Small enough to avoid if you're cold, but big enough to enjoy the refreshment of it.

Window projections

Something that would project video or text or something on dark windows in subways. That way, when you're looking out the window at the scenery and then the train ducks into a tunnel, suddenly you're not the creepy girl checking everyone out in the reflection. And you'd have something to look at besides the dandruffy-haired guy sleeping in front of you.