If you are interested in Mapreduce (/Hadoop), I would like to recommend participating or submitting your paper to the 2nd International Workshop on Mapreduce and its applications (MAPREDUCE’11). The mapreduce workshop is held in correspondance with the The 20th International ACM Symposium on High-Performance Parallel and Distributed Computing in San Jose, California (June 2011).
(I just joined the mapreduce workshop as a program committee member)
Best regards,