gsiegman.com

I am a recent convert to the Mac. I was a Windows PC user for over 15 years, and more recently an Ubuntu user for 2 years. One of the things I am struggling with most as a new user is figuring out what the must-have Mac software is. So I'm putting the question out there. What software should a Mac user not be without and why? I spend most of my time doing Django development, but would also like to hear about small one purpose utility programs as well; such as time management, to-do list software, RSS readers, etc. Please leave your recommendations in the comments section or send them to me on Twitter @gsiegman.