Empowering Visual Categorization With the GPU, from the Intelligent Systems Lab Amsterdam (ISLA), in IEEE Transactions on Multimedia Feb 2011. It sets a high benchmark for future research. More importantly, the analysis is comprehensive. It also makes thorough comparisons with related work.
Review: Kd-tree Traversal Algorithms for Ray Tracing, to appear in Computer Graphics Forum. Some algorithms are motivated by the SIMD/vector architecture.