nvALT 2 by Brett Terpstra: This is a very quick note taking app I use on the Mac. It’s actually a fork of Notational Velocity, a note taking app for the Mac. I love this because it uses Dropbox to sync with WriteRoom on the iPad. I can create a note on the iPad or the Mac, and the note is instantly synced via Dropbox. Each note is its own text file, and completely searchable. I use hashtags in the notes to denote subjects (or tags) and it makes it easy to find information.