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DEMs are staged at resolutions of 2 arc-second (about 60 meters north-south, varies from 20-35 meters east-west), 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and are available in either ArcGrid, GridFloat, or IMG formats in 1x1 degree tiles in The National Map Viewer. DEMs at 1/9 arc-second (about 3 meters) resolution are staged only in IMG format in 15x15-minute tiles. DEMs at 1-meter resolution are staged only in IMG format and in 10,000 x 10,000 meter tiles. DEMs at 5-meter resolution are staged in ArcGrid format in 1 x 1 degree tiles, and are only available over Alaska.
For dynamic extracts of NED to include other formats, such as GeoTIFF or BIL_16INT, use the Multi-Resolution Land Characteristics (MRLC) Viewer: http://www.mrlc.gov/viewerjs/. The default output format for DEMs in the MRLC Viewer is ArcGrid but you can then modify the data request to change to other formats prior to download.