Whenever I am learning a new programming language I often find it helpful, after learning the basic syntax, to try to learn the libraries and such by solving problems from Project Euler http://projecteuler.net/ or many other websites which give various toy problems in computer science. There are many such websites. I am interested in finding (or making) a list of problems of this sort from which one could slowly familiarize oneself with the core biological, statistical and technical concepts in bioinformatics (I am a n00b at biology, but have a background in computational science). I want to emphasize the comparison with Project Euler. No problem should be excessively technical, and the early problems should assume only basic familiarity with biology and statistics. I have already collected a few questions. Can any one point me to an existing list? Should we start a community wiki page for the topic?