This book constitutes the refereed proceedings of the Second International Symposium on Computer Science in Russia, CSR 2007, held in Ekaterinburg, Russia, September 3-7, 2007 The 35 revised papers presented were carefully reviewed and selected from 95 submissions. All major areas in computer science are addressed; the theory track deals with algorithms, protocols, and data structures; complexity and cryptography; formal languages, automata and their applications to computer science; computational models and concepts; proof theory and applications of logic to computer science. The application part comprises programming and languages; computer architecture and hardware design; symbolic computing and numerical applications; application software; artificial intelligence and robotics.