In 2006, Rep. Tom Davis introduced the DC Fair and Equal House Voting Rights Act of 2006 in the U.S. House, if enacted, the act would have the effect of increasing the size of the electoral college by 1. The bill's primary purpose is to give House representation to the District of Columbia but the bill also grants, for partisan balancing, an additional House seat to Utah, and increases Utah's electoral votes by 1, since Utah is likely to vote Republican and the District of Columbia is likely to vote Democratic. However, this will only be valid until the next census, when the extra seat will be reapportioned like all other seats. The District of Columbia's electoral vote count would remain unchanged at 3, as required by the 23rd amendment. Even though the size of the electoral college would increase to 539, a candidate would still need 270 electoral votes to win.
Source: http://www.dcvote.org/advocacy/dcvramain.cfm

Also, the National Popular Vote Interstate Compact is a proposed agreement between states in the United States dealing with their allocation of electoral votes. This interstate compact would effectively shift the method of election of the President of the United States to a national popular vote system. By the terms of the compact, states agree to give all of their electoral votes to the national popular vote winner, regardless of the balance of votes in their own states. The compact would only go into effect once it was joined by states representing a majority of the electoral college.
Source: http://www.nationalpopularvote.com/