As far as I can see, the best invention of 2007 going by the definition of the word (an innovation that is both novel and non-obvious) would be the Microsoft Surface (as seen demonstrated here by a Mr. Bill Gates).
It's the next step in iPhone style technology. I love the interactivity with the touch screen and the way it reacts to other devices. It's the final piece of home technology equipment I'd like until the flying car arrives.
Here's a five minute promotional video which gives a more in-depth view at Surface's features:
Not everyone is impressed by it, however. Here's Sarcastic Gamer doing what he does best (original version is here):
No matter your opinion of Microsoft, they are clearly technological pioneers. They might be a bit too ambitious and fail in some critical areas (i.e. the original Xbox lacking in comparison to the much older Playstation 2, the Xbox 360 having a 30% failure rate and Vista turning consumers back to XP) but they do push the competition. The Zune is currently giving the classic iPod a run for it's money in America and the Xbox 360 is currently leading the race in the Console wars due to it's huge online base and a surplus of excellent games.
This, in my pseudo-professional, is the future. It might be a bit pricey (it's somewhere in the area of $10,000 which is slightly more than your average table). It's not something I'd like to use as a foot rest, although you never know, maybe some funky rings will shine out from the heels of your shoes or something.
This is day five in the Science Week Ireland blogging competition as hosted on Mulley.net.