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im not sure this is the right forum but since the headline says also "chilling after a day of programming" I thought I could post a tip for a mathmatical tool which seems to be something for the old idealists like myself, prefering programming tools to be free of charge and with an anarchistic touch. At www.varible.com you find a program similar to Matlab, it still seems to be under construction and it is not as advanced as the original, on the other side it gives you the opportunity to calculate standard functions in an easy way and if you want to, share your programs with friends and colleagues.
It is at least better than other "online calculators" I have found.