National Blue Alert Act of 2010 - Directs the Attorney General to: (1) establish a national Blue Alert communications network within the Department of Justice (DOJ) to disseminate information when a law enforcement officer is seriously injured or killed in the line of duty; (2) assign a DOJ officer to act as the national coordinator of the Blue Alert communications network; and (3) provide grants to states for the development or enhancement of programs and activities to support Blue Alert plans and the Blue Alert communications network. Sets forth the duties of the national coordinator, including working with states to develop additional Blue Alert plans in the network, establishing voluntary guidelines for states in developing Blue Alert plans, developing protocols for efforts to apprehend suspects, and establishing an advisory group to assist states, local governments, law enforcement agencies, and other entities in initiating, facilitating, and promoting Blue Alert plans.