Out nation's capitol, Washington, D.C., is represented in the House by Del. Eleanor Norton. This has always been the case, but with 600,000 citizens (a little less than all of North Dakota, but more than Wyoming), its representative in Congress is not allowed to vote, equal to the representative from Guam or Puerto Rico.
The District of Columbia House Voting Rights Act of 2009 means to change that, by creating a seat for D.C. residents in the House, while also creating another seat that will be assigned to the state most deserving, which happens to be Utah (whose three existing representatives each serve about 910,000 people, so four would reduce that to about 682,000).