[peteevans]

I'd say yes and no. Given that way that a lot of HR departments just seem to run a keyword search for jobs and this often hits languages. This can work against you. If the cool stuff is relevant then that will be good once you get past the HR, if not it's cool anyway. However, unpopular languages can work in your favour when the number of developers drop or the languages become more popular, for instance Cobol was suddenly a goldmine around Y2K and who knows where current tech will go. However, getting extra languages under your belt is a good thing both for employability and learning new programming paradigms.