Yup - on January 6th 2009 President Bush announced 3 new marine Protected Areas (MPAs) - declaring them National Monuments.
1. Marianas Trench National Monument - includes 3 componments - reefs and islands; the trench itself; undersea volcanoes and thermal vents
2.The Pacific Remote Islands Marine National Monuments protects the pristine coral reef ecosystems around Kingman Reef, Palmyra Atoll, Howland, Baker, and Jarvis Islands, Johnston Atoll, and Wake Island – the site of a pivotal battle in World War II and an important military base today.
3. The Rose Atoll Marine National Monument protects the pristine coral reef ecosystem around a remote part of American Samoa.
Combined these cover 195,274 km2 - a huge area in a single MPA declaration, but still much smaller than Kiribati's 410,500km2 Phoenix Islands MPA.
Don't have any comprehensive maps - though am sure there will be some out there. One very basic US one I have is posted here and one of the Mariana Trench NM too.....