WilliamT from the Google warehouse also has a few ship models, so I thought I'd add his Nimitz class aircraft carrier.

Go directly to: http://sketchup.google.com/3dwarehouse/details?mid=e837d802b2428348c1ccec171a275967 for his model.

From YouTube: http://www.youtube.com/watch?v=COq1kK9fkAw
A decent video that gives a good feeling of how massive these carriers are. The music is a bit much, so you may want to turn it off.

From Wikipedia: http://en.wikipedia.org/wiki/Nimitz_class
The Nimitz-class supercarriers are a line of nuclear-powered aircraft carriers in service with the United States Navy, are the largest capital ships in the world, and are considered to be a hallmark in the United States' superpower status. These ships are numbered with consecutive hull numbers starting with CVN 68. The letters CVN denote the type of ship: "CV" is the hull classification symbol for aircraft carriers, and "N" indicates nuclear-powered propulsion. The number after the CVN means that this is the 68th "CV", or aircraft carrier.

Nimitz (CVN-68), the lead ship of the class, was commissioned in 1975. As of 2006, George H. W. Bush (CVN-77), the tenth and last of the class, was built by Northrop Grumman Newport News and will enter service in 2009. Bush will be the first transition ship to the Ford class, the first ship of which began construction in 2007 and will incorporate new technologies including a new multi-function radar system, volume search radar, an open architecture information network, and a significantly reduced crew requirement. To lower costs, some new technologies were also incorporated into Ronald Reagan, the previous carrier to the Bush, though not nearly as many as will be involved with Bush.

Because of construction differences between the first three ships (Nimitz, Eisenhower and Vinson) and the latter seven (from Theodore Roosevelt on), the latter ships are sometimes called Theodore Roosevelt-class aircraft carriers, though the U.S. Navy considers them to all be in one class.[1] As the older ships come in for Refueling and Complex Overhaul (RCOH), they are upgraded to the standards of the latest ships.[2]