But if you want specific applications of evolution, I'll give you a couple.
1. Microbial resistance. Pathogens become resistant to therapies rather quickly, which is clearly evolution. We've had pretty good success in combating this because of our understanding of this process. The new flu vaccine every year is because of this, and the new generations of antibiotics.
2. Gene identification and discovery. Looking at the evolution of genetic material gives us clues at protein structure and function. Homology of different genes gives us insight into normal physiology and how to treat pathologic states.
3. Phylogenetics and epidemiology. With evolution, we can learn a lot about populations of pathogens. The evolution of SIV to HIV marked the introduction of AIDS into humans. Currently, a new strain of malaria is brewing in Indonesia, and close surveillance of its epidemiology and diversity will hopefully help us be ready for it if it jumps to humans.
4. Directed evolution breeds new drugs for various diseases, as well as biopolymers and pigments.
5. Evolution is the foundation for many algorithms used in engineering, computer science, architecture, drug design and discovery, etc.
Read up on more if you feel like it
CA215: Practical uses of evolution.