Cognitive Lab

Cognitive Lab
This site has a bunch of tests and activities said to increase your brain speed. It seems loosly related to stanford, but it also has a very commerical feel to it. But it looks of interest.
From Google: Cognitive Labs is creating the largest repository of memory tests and games and has 1.5 million members. To access tests all you have to do is register. Our tests and games have been involved in numerous scientific studies of memory, attention, and dementia conducted at Stanford and other institutions and allow people to follow their progress over time. Several awarded and pending U.S. patents apply to our technology.