What is the best programming language to learn right now to advance your career?

I Don’t know, but I would love to Hear you thoughts. Please comment.

My opinion on the Mater is that Java is a very widely used language, but If you don’t know it by now, it may not be the best choice to go with. Many of the Jobs out there for Java programmers require you you to an expert with years of experience. I was thinking something some like ruby on rails, Iphone and Android (need Java anyway) development.