Linking your Highrise account to Tracks gives you extra features. If you haven't already created an account using your Highrise login details, here's how to link your existing Tracks account to Highrise:
After you login, click on settings on the top right hand side of the screen
On the settings page, under "Link your Highrise account", click on the "Link to Highrise" button
You'll then be asked to enter your Highrise login details and confirm that you want Tracks to integrate with Highrise.
Note: this is all handled by 37signals, so it's the same as logging into Highrise or Basecamp or any other 37signals product.
You will then be redirected back to Tracks. If you don't get a confirmation message that your accounts are linked then try again or contact gregor@goldhawklabs.com.
Tell your colleagues who use Tracks to login and link their accounts, so that they can benefit too