Earlier this month the five surviving veterans of the Doolittle Raid gathered in Dayton, OH to commemorate the 70th anniversary of the operation. Also in attendance were 20 B-25 Mitchell bombers, the type of aircraft that performed the mission. You can find many photographs of them at the Airpigz blog report of the event. Historic photographs of the departure of the bombers from the USS Hornet may be found at this US Navy commemorative Web page.
Nineteen of the B-25's provided a formation fly-past over the National Museum of the United States Air Force in Dayton, Ohio on April 18th, 2012. Here's a great video of the occasion, filmed from inside one of the participating B-25's. I highly recommend watching the video in full-screen mode - and adjust your computer's speaker volume to hear those lovely radial engines!
What a great piece of living aviation history!
May the many Doolittle Raiders who are no longer with us rest in peace, as well as all those killed during and after the raid (particularly the quarter of a million Chinese murdered by Japanese armed forces during their search for the raiders).