Invited Talks -- The Complexity of Querying External Memory and Streaming Data -- The Smoothed Analysis of Algorithms -- Path Coupling Using Stopping Times -- Circuits -- On the Incompressibility of Monotone DNFs -- Bounds on the Power of Constant-Depth Quantum Circuits -- Automata I -- Biautomatic Semigroups -- Deterministic Automata on Unranked Trees -- Complexity I -- Decidable Membership Problems for Finite Recurrent Systems over Sets of Naturals -- Generic Density and Small Span Theorem -- Approximability -- Logspace Optimization Problems and Their Approximability Properties -- A Faster and Simpler 2-Approximation Algorithm for Block Sorting -- Computational and Structural Complexity -- On the Power of Unambiguity in Alternating Machines -- Translational Lemmas for Alternating TMs and PRAMs -- Collapsing Recursive Oracles for Relativized Polynomial Hierarchies -- Graphs and Complexity -- Exact Algorithms for Graph Homomorphisms -- Improved Algorithms and Complexity Results for Power Domination in Graphs -- Clique-Width for Four-Vertex Forbidden Subgraphs -- Computational Game Theory -- On the Complexity of Uniformly Mixed Nash Equilibria and Related Regular Subgraph Problems -- Simple Stochastic Games and P-Matrix Generalized Linear Complementarity Problems -- Visual Cryptography and Computational Geometry -- Perfect Reconstruction of Black Pixels Revisited -- Adaptive Zooming in Point Set Labeling -- Query Complexity -- On the Black-Box Complexity of Sperner's Lemma -- Property Testing and the Branching Program Size of Boolean Functions -- Distributed Systems -- Almost Optimal Explicit Selectors -- The Delayed k-Server Problem -- Automata and Formal Languages -- Leftist Grammars and the Chomsky Hierarchy -- Shrinking Multi-pushdown Automata -- Graph Algorithms -- A Simple and Fast Min-cut Algorithm -- (Non)-Approximability for the Multi-criteria TSP(1,2) -- Semantics -- Completeness and Compactness of Quantitative Domains -- A Self-dependency Constraint in the Simply Typed Lambda Calculus -- A Type System for Computationally Secure Information Flow -- Approximation Algorithms -- Algorithms for Graphs Embeddable with Few Crossings Per Edge -- Approximation Results for the Weighted P 4 Partition Problems -- The Maximum Resource Bin Packing Problem -- Average-Case Complexity -- Average-Case Non-approximability of Optimisation Problems -- Relations Between Average-Case and Worst-Case Complexity -- Algorithms -- Reconstructing Many Partitions Using Spectral Techniques -- Constant Time Generation of Linear Extensions -- Complexity II -- On Approximating Real-World Halting Problems -- An Explicit Solution to Post's Problem over the Reals -- The Complexity of Semilinear Problems in Succinct Representation -- Graph Algorithms -- On Finding Acyclic Subhypergraphs -- An Improved Approximation Algorithm for TSP with Distances One and Two -- New Applications of Clique Separator Decomposition for the Maximum Weight Stable Set Problem -- Automata II -- On the Expressiveness of Asynchronous Cellular Automata -- Tree Automata and Discrete Distributed Games -- Pattern Matching -- A New Linearizing Restriction in the Pattern Matching Problem -- Fully Incremental LCS Computation.