Besides fossils what other evidence is there for evolution?

What are other types of evidence for evolutionary theory, other than fossils?

Darwin's observations on the voyage of the Beagle, and succeeding scientist's observations that conform to his hypotheses. Domestication of plants and animals by purposeful and accidental selection over the past ten thousand years. Real-time observation of changes in bacteria, viruses and simple animals. A hundred years of fruit-fly experiments. DNA analysis and genetic decoding. The appearance of new stains of drug-resistant microbes comes quickly to mind. The breeding of animals for hunting and agricultural purposes, and for sporting purposes and pets, has been practiced for 1000s of years and is essentially human-directed evolution, and in many cases is historically documented. The principals of getting a good goat or cow were known and practiced long before anybody thought to extrapolate them backwards to the origin of a species and call it a scientific theory.