Go Here to create your TSBT account; or visit here if you'd like to read about the project first.
Here's an extract from the frontpage:
MindModeling@Home (Beta) is a research project that uses volunteer computing for the advancement of cognitive science. The research focuses on utilizing computational cognitive process modeling to better understand the human mind. We need your help to improve on the scientific foundations that explain the mechanisms and processes that enable and moderate human performance and learning. Please join us in our efforts! MindModeling@home is not for profit.