I use Notational Velocity on my Mac all the time. It holds all my notes, lists and any other snippet of text. I love the interface and simplicity, and most of all I love the simple use of text files in Dropbox as a store. This way I can access my notes anywhere, without needing NV to be installed. I also love the global key binding feature so that I can quickly raise it with Cmd+Shift+N.
Inspired by The Setup and Pratul’s post, here is how I ‘get my work done’. Hardware I currently use a four-core i7 15" Macbook Pro with 8GB of RAM and a 500GB HDD. I love it. For backups I have a Western Digital 160GB hard drive. I use cheap Skullcandy earphones when I need them (I usually prefer speakers). Operating System I used to be on Arch Linux until I got the MBP.