I just found out about this game, its called "I was an atomic mutant!" and its amazingly cool. Its just like the classic 50s b movies and has you as your pick of four monsters (giant woman, godzilla like creature, giant robot, or flying brain with eyes) and each monster has about 5 different attacks and each level you have to destroy a whole town, while avoiding helicopters, atomic bombs, and tanks and the like. Its so fun. check out http://www.atomicmutant.com/ for screenshots.
Sounds strangely like that game with a giant wolf, Ape, and Lizard, but I cant remember what its called.
Also, for PS 2 is a game called I believe Attack of the Monsters. A bunch of B movie addicts created all new B movie monsters (a giant ant, a slime monster, a robot), gave them fake movie posters and it is excellent. If you have the money and the system, this is a wonderful game for people like us (and just like B movies, this game is thin on plot).
That's Rampage you're thinking of, Evan. Great fun.