I'm working on research for a story I'm writing (that will be published on a high ranking computer website) that's essentially about the 10 pieces of software you should pick up as soon as you unpack your Mac and I wanted to see if you guys could help me out by describing your favorite piece of software for the Mac. Doesn't matter if it's free, shareware, or you have to pay for it. However, I'm only looking for practical utilities, like Finder enhancements or disk management, etc. Not so much things that replace your icons with pretty pictures or make your Dock look like it's on fire, considering the website is fundamentally a publication for IT people (though, they cover personal technology too.) So based on that, lets here some pieces of software that you can't live without.