What are the five kingdoms?

The five-kingdom system of classification is only one of a few, and might be superseded. To common knowledge, the five kingdoms of life are:

Monera (bacteria)
Protista (protists - algae and protozoa)
Fungi (yeasts, slime molds, toadstools)
Plantae (mosses, flowering plants, gymnosperms)
Animalia (animals - sponges, jellyfish, worms, starfish, insects, arachnids, vertebrates and so on)

These days, a six-kingdom system seems to be taking over. The kingdoms are:

Archaea (archaebacteria)
Bacteria (bacteria)

Protista (protists)
Fungi
Plantae

Animalia

Note however that this is not very impressive since protists are so diverse that they should really be divided into perhaps 60 kingdoms themselves. Taxonomists are still working at protist classification.