I learnt a lot when I attended my very first EuroSciPy conference. Not all of it was practical. For instance, did you know Python is being used to come up with new breeds of chicken? So from animal breeding to cognitive neuroscience to astrophysics, EuroSciPy was indeed the place to be to talk with folks using Python for various forms of science.
Prior to the conference my impression was that science is all about Python, thanks in large part to the ease-of-use of the language and the excellent numpy and scipy libraries which are so widely used for manipulating and processing data. So I guess I was pretty surprised that my biggest takeaway from the Python conference were two other languages.