What apps are essential for mac?
tortilla: Others mentioned here are great.  In addition, check these out:http://perian.org/ - adds native support to QuickTime for many video formatshttp://www.fluidapp.com/ - Fluid, SSB (site specific browsers)http://www.obdev.at/products/littlesnitch/ - LittleSnitch, Monitor and block outgoing internet connectionshttp://www.skitch.com/ - Skitch, screen capture and sharinghttp://derailer.org/paparazzi/ - Paparazzi, Full screenshots of websiteshttp://www.sequelpro.com/ - SequelPro, MySQL gui (I like Querious, but that's a paid app)http://wakaba.c3.cx/s/apps/unarchiver.html - The Unarchiver, unpacker program handles almost every formathttp://freeverse.com/apps/app/?id=7013 - Think, helps you focus on a single apphttp://www.heliumfoot.com/mercurymover/ - MercuryMover, resize, move windows with keystrokes (If you're OCD about window sizes like me)Other honorable mentions: Coda, Transmit, TwoUp, Typinator, UnRarX, CSSEdit