I have three cats, five gerbils, six fish... In the past I have had two hamster, one rat, two guinea pigs, two wild robins and four mice. I've had gerbils and cats consistently through my sixteen {almost seventeen} years of life.
Lots. :P Five cats, three geckos, a frog, two hermit crabs, a conure bird, two rabbits, and a horse. Also snake-sit my teachers corn snake often enough, so I count him too.
And if other fish (besides betta's, of course) count, then I also have two green spotted puffer fish, a black moor gold fish, three koi, a bristlenose pleco, some yoyo and zebra loaches, a huge school of cardinal, neon (black and regular), and glowlight tetras, and a glowfish tank. Also planning on getting my own corn snake sometime soon, as well as a few ratties because they're adorable. And when I move back to Oregon I'm getting a ferret and an axolotl (darn California and it's illegal pets >.>).