I've noticed that only "business laptops" (eg. Dell Latitude series, Lenovo ThinkPad T or W series, etc.) tend to have trusted platform modules (TPMs). In today's world, security is not a business-exclusive topic, and end users can benefit from using very simple, easy-to-use tools like Windows Bitlocker (Vista, 7, 8) just as much as business users can.
Does anyone know why we do not see modern, consumer grade laptops coming with TPMs? Even on business laptops, TPMs are simply an optional component, as they can still be obtained sans the TPM