Mac Applications to Test Drive

Quicksilver

ShiftIt
(Moves Windows via Keyboard, Is Like Aero Snap for Your Mac)
Coda

Dragoman
(Batch Converts Nearly Anything with Drag and Drop Simplicity)

GMapCatcher
(Browses Online Maps and Saves Them for Offline Use)

Alfred
(Another Nice Application Launcher, Quicksilver Alternative for Mac Users)

Sweet Home 3D
(Models Your Home, Rearranges Your Furniture Without Breaking a Sweat)

Komodo Edit

Highlight

Artisteer
Wordpress/Joomla template builder recently released for Mac.


Tested and kept

Skitch
I use it almost every day now to create screenshots for web development and other geeky stuff.