Try R, a free course

I've been branching out a bit in my spare time with regards to other tools and languages for manipulating and analysing data. The R language has interested me for a while, and I came across this free tutorial which serves as a pretty good introduction to its basic usage and syntax. It does so in a rather nice interactive web interface. Highly recommended if you have a spare hour or two to go through the course. As a plus, there is a link to a discount on the O'Reilly book Data Mashups In R once the course has been completed. R itself can be downloaded from here. Get stuck in fellow data geeks!