How many taxonomic categories?

Answer:
seven, and they are:

Kingdom
Phylum
Class
Order
Family
Genus
Species

An easy way to remember this is by saying Kings Play Chess On Fat Guy's Stomach. It's silly, but it helps me remember. ;)
First answer by Cidorfi. Last edit by Cidorfi. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].