Wow. Looking over that huge list of names sure brought back some memories. Has it really been 20 years? Jesus we're getting old...
Other than the birth of MAME (and Sparcade), this was the most memorable moment for me, from mid-1997:
-0.26: MAME has entered in vectorial emulation world. All in a time, we have support for Asteroids, Asteroids Deluxe, Black Widow, Battlezone, Gravitar, Lunar Lander, Red Baron, Spaceduel [sic] and Tempest.
Seeing the screenshots of the vector games, on Delite's (remember him?) web page, was also quite memorable...
"One of these days, I'm going to cut you into little pieces!"- Nick Mason, Pink Floyd