Which Invention Has Changed Your Life Most in the Last Decade?

Dec. 31, 2009— -- It's been a decade of incredible change, with countless products and services launched to ease and/or better the way we live our lives.

As we reported Wednesday night, there's a laundry list of things that didn't exist 10 years ago that are now a big part of modern life: Facebook, iPods, Skype, Twitter, YouTube. ... You name it.

So our question to you on this New Year's Eve: What invention -- it can be a product and/or service -- has changed your life most in the last decade?