Here are some useful History research websites:

• The Ultimate History Resources Website - look specifically at the "Outlines and Charts" page - it's a really great review.  The other information may or may not be useful...
• The Library of Congress - the "American Memory" database has literally thousands of documents that are searchable and amazing!
• National Archives Primary Source Analysis - searchable database from the Archives.  Note the blue box with document analysis worksheets!  Also, use their site to search for documents.
• The Avalon Project at Yale
• The Modern History Sourcebook
• Atlanta History Center "Album" - database of 10,000+ images from the Kenan Research Center at the AHC documenting people, places, and events in Atlanta from 1895-1992.
• Colonial Williamsburg Research Portal - focused on Colonial era sources, but often has more contemporary offerings in their newsletter or teacher resources.
• From Revolution to Reconstruction...and what happened afterwards - digital documents with decent background in many cases
• History Central - another documents database, broken down by era.
• National Atlas - an interactive map database that lets you "customize" maps based on the most recent data!  Go to the "Map Maker" section to create...
• LIFE Photo Archive - linked through a Google search, this is an archive of photos from LIFE Magazine - some published, some unpublished in its pages.  They're Amazing!

And here are some things that are just plain interesting:

• 1491
• America: Found and Lost
• How the Pilgrims Made Progress
• Ergot Poisoning and the Salem Witchcraft Trials
• Too Late to Apologize - someone with a lot of free time and a love of history....  nice!
• The Very Best Way to Study the Hamilton-Burr Duel
• Travelin' TJ (remember Flat Stanley?  This is Monticello's version...)
• Restoration work at Montpelier
• Emerson's The American Scholar
• The Surprisingly Cool History of Ice
• "Born Free And Equal" - Ansel Adams' Photographs of Japanese Internment
• News of the Holocaust: Why FDR Didn't Tell and the Press Didn't Ask (Critical of FDR, US)
• America and the Holocaust (From American Heritage, addresses criticisms of US in WW2)
• World War II in the Aleutians: Japanese Attack at Dutch Harbor
• We Didn't Start the Fire: A Look at Modern History

US Presidents Songs:

• Simple, Yankee-Doodle-ish version
• Nikelodeon's Version
• The Animaniacs - wordy, but catchy!
• There are a million others out there - find one that works for you!  :)