Apps I Use

Desktop
TextExpander – saves a tremendous amount of repetitive typing
TotalFinder – a great enhancement to Finder on Mac OS X

Mobile

Cross-platform
Evernote- I rely heavily on Evernote for ALL of my note-taking. I still hand write some things in a journal when completely unplugged, but Evernote has helped me go completely paperless. Seriously. I use Evernote on my desktop, laptops (Mac and PC), iPad, iPhone and any web browser I happen to be near.