ATTpsc.com - Login for AT&T employees and retirees.
AT&T Logon - Pension Service Center
ATTpsc.com is the "global logon" for AT&T employees and retirees. The site explains that current employees should login with their ATTUID, and retirees with their HRID.
To visit visit ATTpsc.com, click here.
Fun facts: AT&T has more than 250,000 employees worldwide, and it reported more than $100 billion in 2009 consolidated revenue.
Contact Page on ATT.com (geared towards customers)