Ethanol Infrastructure Expansion Act of 2007 - Directs the Secretary of Energy, in coordination with the Secretary of Transportation, to: (1) award up to $1 million to one or more eligible firms to conduct feasibility studies for the construction of one or more dedicated ethanol pipelines; and (2) award up to $1 million to one or more eligible firms to carry out a program to address technical factors that prevent the transportation of ethanol and biodiesel in existing hazardous liquid interstate transmission pipelines.