Defined Contribution Plan Fee Transparency Act of 2007 - Amends the Internal Revenue Code to impose penalties on: (1) employers and multi-employer defined contribution plans for the failure of their plan administrators to provide to plan participants or beneficiaries written notices of plan fees and expenses and investment alternatives; and (2) providers of services to defined contribution plans for failure to provide certain information to plan administrators, including an estimate of total fees and expenses expected to be paid under a service contract and an itemization of the services to be provided under such contract.