the fantastic games list provided by andy in the previous post would indeed be a good place to look, ---- it's a master list of all audio games.
for representations, I'd agree with Cx2 about gma, they have an audio fps vaguely based upon doom, a complex simulation submarine commanding game (with user created missions), and a fps tank games.
Jim Kitchin's site and http://www.omninet.net.au/~irhumph/blindgamers.htm Create various card, board and puzle games in audio, ---- from hearts and solitare to battleships.
Sound Rts is an audio real time stratogy similar to warcraft.
then there are audio adaptations of classic games, pcs (who have the fantastic games list), produce audio packman, usa games' montizuma game (a remake of the atari platformer montizuma's revenge), has already been mentioned, and draconis entertainment at http://www.draconisentertainment.com/ produce audio Pinball games, and a very good space invaders varient.
for audio racing, I'd recommend rail racer found at http://www.blindadrenaline.com/ or topspeed 2 on www.playinginthedark.net.
finally, for real time sport, there is vip gameszone found at http://vipgameszone.com/index.php
Hopefully this is a good selection of various genres of games in audio which should give good material for your paper.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)