... Also, there was Neil Armstrong's ejection from the Lunar Landing Research Vehicle in 1966:

http://en.wikipedia.org/wiki/Lunar_Landing_Research_Vehicle

(And I see another test pilot, Joe Algranti, also had a very close call flying a second-generation LLTV -- ejecting 0.6 seconds before it crashed!)

NASA came very close to losing more astronauts during mission prep for Apollo, in addition to the Apollo 1 crew. (Even if we leave aside the four astronauts killed in T-38 crashes in the 1960s.)