In the new Dynamics AX the employee self service workspace serves as a central place to do common functions that an employee might have to action, related to HR, expense or project data. Because the new Dynamics AX is accessed through a browser then you can broaden the reach of employees in the organization accessing a single system.
Here is a quick overview.
AX Build 7.0.1265.3015
You could customize this to add links to other organizational data like policy information you might have stored on other sharepoint or external sites.