A few things that have become unnecessary essentials lately:
The Moth podcast
Sound Opinions podcast (you were right, Robby, it’s great)
BetterWorld Books: great selection, free shipping, and they are very conscientious, even towards local libraries.
The Iconogram and Blog Networks Facebook apps: windows into heaven, and into the make-up of the communities behind your favorite blogs.
1000 Recordings to Hear Before You Die: I got to scan this before sending it off to a lucky winner. If you’re an optimist, there’s also 1001 Albums You Must Hear Before You Die.
The Freecycle Network: Pass it around
Congresspedia: Real made up stuff about congress
phonezoo: Make your own dang ring tone