JavaScript is the future... wait wha?
1) JavaScript engines have become ridiculously fast thanks to corporate investment from the likes of Apple, Google, Mozilla etc.
2) There are a lot of JavaScript developers out there, the number is growing.
3) Browser based JavaScript is the most widely available programming platform, ever.
3) JavaScript development is non-blocking (event driven), and closure intensive (Ruby and Perl fans rejoice).
4) Node.js uses Chrome's V8 to make non-blocking event based service development easy and performant. The community momentum is truly astounding.