There are many reasons why it is beneficial for us if you do sign up to become a registered user. First of all, registering allows us to assess the impact of this site more easily. Since many agencies and foundations want to see quantitative evidence indicating the success of a site like this, your registration is very important to us to receive future funding for the maintenance and improvements of this site. In addition, we can send out email notifications and newsletters if you choose to sign up for these functions. From your perspective, signing up allows you to download additional content (e.g., manuals, modifiable demos to run directly on your computer, stimulus materials etc.). In the future, we will also allow users to submit additional materials to add to the content of this site.