The Apple Mac OS X product page. Describes features in the current version of Mac OS X, a screenshot gallery, latest software downloads, and a directory of resources. http://www.apple.com/macosx/
Collection of tools and information for scientific computation on Mac OS X including Fortran (g77, g95, HPF), MPI, OpenMP, Cactus, Globus, and RNPL among others. http://hpc.sourceforge.net/
News stories, tutorials, resources for Objective-C programmers using, or wanting to learn more about, Mac OS X's Cocoa environment. Also covers OpenStep and Web Objects programming. http://www.stepwise.com/
(Formerly macosxlabs.org) A community of IT professionals sharing information and solutions to support Macs in an enterprise. http://www.macenterprise.org/
Collection of widgets and reviews of widgets that run on Apple's system 10.4. Also includes a forum and a "how-to" section on making your own. http://www.dashboardlineup.com/