I've started a new gig working with Lumos Labs. They have a web site Lumosity which provides Brain Training (aka Brain Exercises or Brain Games) that keeps your thinking muscles in shape. I worked with them earlier as a consultant but it looks like I'll be switching to full time Director of Engineering in April when Mie, Tesla and I get back from South America (I've alread arranged great apartments in Lima and Buenos Aires). The vacation is a last blast before descending back into the regular full time employee world that I haven't been in since quiting my startup company in 2004.
Anyhow, the brain games are pretty fun, and there's a lot of science behind their efficacy. You should check them out. My favorites are Raindrops, Word Bubbles and Memory Match. The games are designed to improve four cognitive areas: Memory, Attention, Processing Speed and Cognitive Control. It's nice to know that there's some healthy stuff going on, but they are also fun to play and enough of a challenge to give you real satisfaction as you improve.
This is my new desktop image on my workstation: Brain storming.