Indeed Jobs has a neat tool for showing trends in job postings. Seems like python, php, ruby are all on the upswing as expected. Cold Fusion is on the downswing (as expected). Just for kicks I threw QA in the mix. Guess which term has more job postings? Yeah, if you are still trying to figure out what language or framework to learn next, consider "QA". You'll have a larger pool of jobs waiting for you.