I just finally finished building my own little gladiatorial arena in my current fortress. Since I'm making a backup save so I can try several different fights, I figured I might as well offer anyone else who wants to watch a good fight the opportunity to check it out.
You can download the file here. (8mb)
Once in the fortress, press shift-F4 to jump to the lower level of the arena. The controls are in a small room to the southwest, far enough away for the lever operator not to become afraid of the combatants. The levers do the following, ordered from far left to far right:
1 - white - release the war dogs (8 dogs)
2 - black - open/close the door (bridge)
3 - yellow - release top goblin cages (8 goblins, mostly thieves)
4 - yellow - release middle goblin cages (8 goblins, mostly thieves)
5 - yellow - release bottom goblin cages (8 goblins, mostly thieves)
6 - blue - release the Titan
7 - white - release the monkeys (16 adult and baby rhesus macaques)
Honestly, it would be a better fight if captured goblins didn't lose their aggression ai, a fact I'd forgotten when I began construction. Still, it's amusing to watch the titan drop kick baby monkey heads the length of the arena. Note that slower computers will likely choke a bit on this fortress, as I like to build BIG and there are nearly 150 dwarves walking around. Have fun!