List of accepted papers for APPROX 2009: Ashkan Aazami, Joseph Cheriyan and Krishnam Raju Jampani. Approximation Algorithms and Hardness Results for Packing Element-Disjoint Steiner Trees in Planar Graphs Julia Chuzhoy and Paolo Codenotti. Resource Minimization Job Scheduling Ronald Koch, Britta Peis, Martin Skutella and Andreas Wiese. Real-Time Message Routing and Scheduling Katarzyna Paluch, Marcin Mucha and Aleksander Madry. A 7/9 Approximation Algorithm for the Maximum Traveling Salesman Problem Rohit Khandekar, Tracy Kimbrel, Konstantin Makarychev and Maxim Sviridenko. On Hardness of Pricing Items for Single-Minded Bidders Friedrich Eisenbrand and Thomas Rothvoss. New Hardness Results for Diophantine Approximation Anupam Gupta, Ravishankar Krishnaswamy, Amit Kumar and Danny Segev. Scheduling with Outliers Saurav Pandit, Sriram Pemmaraju and Kasturi Varadarajan. Approximation Algorithms for Domatic Partitions Brian Tagiku, Adam Meyerson and Douglas Carroll. Approximations for Aligned Coloring and Spillage Minimization in Interval and Chordal Graphs Avner Magen and Mohammad Moharrami. Robust algorithms for Maximum Independent Set on Minor-free graphs based on the Sherali-Adams Hierarchy Jon Lee, Maxim Sviridenko and Jan Vondrak. Submodular Maximization Over Multiple Matroids via Generalized Exchange Properties Chandra Chekuri and Iftah Gamzu. Truthful Mechanisms via Greedy Iterative Packing Gaurav Kanade, Matt Gibson, Kasturi Varadarajan and Erik Krohn. An Approximation Scheme for Terrain Guarding Venkatesan Guruswami and Ali Kemal Sinop. Improved Inapproximability Results for Maximum k-Colorable Subgraph Chandra Chekuri, Alina Ene and Nitish Korula. Unsplittable Flow in Paths and Trees and Column-Restricted Packing Integer Programs Alexander Jaffe, James Lee and Mohammad Moharrami. On the optimality of gluing over scales Rolf Harren and Rob van Stee. Improved Absolute Approximation Ratios for Two-Dimensional Packing Problems Thomas Rothvoss and Laura Sanita. On the complexity of the asymmetric VPN problem Jose R. Correa, Martin Skutella and Jose Verschae. The Power of Preemption on Unrelated Machines and Applications to Scheduling Orders Brian Tagiku and Adam Meyerson. Minimizing Average Shortest Path Distances via Shortcut Edge Addition Zeev Nutov. Approximating Node-Connectivity Augmentation Problems Guy Kortsraz and Zeev Nutov. Approximating some network design problems with node costs Konstantinos Georgiou, Avner Magen and Madhur Tulsiani. Optimal Sherali-Adams Gaps from Pairwise Independence Uriel Feige, Nicole Immorlica, Vahab Mirrokni and Hamid Nazerzadeh. Pass Approximation: A Framework for Analyzing and Designing Heuristics Ankit Aggarwal, Amit Deshpande and Ravi Kannan. Adaptive Sampling for k-means Clustering