Here is an interesting article about the state of the computer book market and some current trends in technical knowledge and the popularity of computer languages. You will see that C# has been steadily growing year after year while Java has been going in the opposite direction during the same period. PHP, ActionScript and Python are the other languages going in a positive direction. In fact, Actionscript in particular has made the jump into the top tier programming languages. As for C#, you could attribute its growth due to it being the language used in programming applications for the iPhone.
So, in short, if you program in C#, Actionscript, PHP or Python, your probably in demand as a programmer. But then again, computers themselves are just a fad anyway. š
