Gratitude: A Daily Journal
It's easy to get caught up in life's petty issues and forget that there is so much to be grateful for.
Get Gratitude: A Daily Journal ($17) to remind yourself of the things you appreciate. You'll be surprised by how positive you'll become. Another good gratitude journal is The Happiness Project One-Sentence Journal ($17), which only requires you to write one sentence per day about what you're grateful for. How simple is that?