The Mono 2.0 OS X Installer is great news because it allows Mac users running some of the best applications that only have been available to Linux users before. Point in case: Tomboy, the best personal wiki and notetaking software in the world.
Quick Look plugin for Adobe Illustrator, InDesign, Freehand and EPS.
A number of Swing components that allow you to create interfaces with a Mac OS X appeal.
"Just open Terminal (/Applications/Utilities/) and type in the following command:
defaults write com.apple.Safari TargetedClicksCreateTabs -bool true"
A collection of high resolution icons for web applications designed for fluid: Google Docs, Facebook Chat, Google Calendar, GMail, Blogger, WordPress, LiveJournal and Facebook
A complete business suite for the Mac, includes scheduling, task management, project management and customer relationship management.
6 links here