I've been using this for around 8 months. It's one of those apps you wonder how you managed without it. It's keyboard-based note-taking, with search and integration with Simplenote. It's a fork of Notational Velocity.
Makes short work of your file renaming tasks with this Mac App.
£39.95 - not the cheapest way to do it, but if you don't like the command line then you'll be well away. On a plane.
Satellite Eyes is a simple Mac app that automatically changes your desktop wallpaper to the satellite view of where you are, right now.
Open-source text editor for OSX.