Getting Things Done by David Allen – A great book on stress-free productivity. Some of it’s a little outdated, but overall it’s very good.
Unlimited Memory by Kevin Horsley – A guide for training your memory.
Brain Training Games
Memory League – A website and app that lets you train and compete in memory games.
Art of Memory Forum – Join a community of people who are really into memory training.
Master of Memory – A great site with a lot of information. Also gives a very good introductory guide for people who are new to memory training.
The Positivity Blog – Teaches strategies for optimism, social skills, simplifying your life and more.