Add additional email accounts to your domain for $5/mo each! Each account is it's own independent custom account for your domain that includes all of these great features:
To get started, log into your POP account and click on Manage for Google Apps
Click Manage Users under the Actions menu
Under the Users tab click on the Create New User button
Enter the new user information then click 'Create New User' to finish
You've now added an additional email account to your domain! They can access their email through their new POP credentials or by logging in traditionally through Gmail.