iConsole is a great new terminal application for Mac OS X. It has a flexible Cocoa interface with tabs and horizontal and vertical split views, keyboard shortcuts for jumping between tabs and views, fullscreen support, search functionality, and is free to use.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
