Just a quick blog post to highlight the numerous courses available on Udemy.com. I just completed Data Analysis in Python with Pandas, and found it very informative, especially with some of the advanced functions in DataFrames.
It is worthwhile keeping an eye on this site, because they have intermittent sales where these courses are deeply discounted. I currently have 35 courses that cover Python, R, Data Science, MongoDB, SQL, MapReduce, Hadoop, teaching kids to code, Machine Learning, Data Vis, Time Series Analysis, Linear Modeling, Graphs, Rattle, Linear Regression, Statistics, Simulation, Monte Carlo Methods, Multivariate Analysis, Bayesian Computational Analyses, and more, most of which were purchased during these sales.
These are great course to learn the underlying languages and concepts and to brush up when you have not used them for awhile.
I highly recommend these courses, just wish I had time to do more of them.