I have been using python more and more in my scientific work. This has been enabled by several excellent resources. The most important resource is the Enthought Python Distribution (EPD). The EPD makes it trivially easy to have a complete python installation that includes many scientific packages. Best of all, the EPD is available for free under an Academic license. All software included in the EPD is open-source so it is straightforward to install an equivalent set of packages; the only difference is convenience. Enthought also offers many tutorials, webinars, and other support resources for scientific python.
Here, I have put together some of my favorite resources, along with a brief presentation that illustrates the power of SciPy/Numpy through several examples based on my own various projects.