The Program for Climate Model Diagnosis and Intercomparison is pleased to announce the release of Version 3.0.0 of Climate Data Analysis Tools, an open-source set of Python modules and tools for accessing, manipulating, and plotting scientific data in general and climate data sets in particular. The tools make extensive use of Numerical Python and its optional Masked Arrays (MA) package and are designed to interoperate with them. The CDAT website is http://cdat.sf.net, and the SourceForge project page is http://sf.net/projects/cdat. Version 3.0.0 is available for Linux and Solaris. Binary distributions are available for RedHat 6.2, RedHat 7.1, SuSe 7.1, and Solaris 5.6. The user must have NetCDF and Tcl/Tk installed before using CDAT. -- Paul Dubois PCMDI Lawrence Livermore National Laboratory