For the most part spiders are desired in the garden.
According to Dr. Linda S. Rayor, Assistant Professor of Entomology, Cornell University, "Spiders are beneficial inhabitants of any garden, ecosystem, or home because of their important contributions to biological control of pest insects. Spiders are considered to be the most important terrestrial predators, eating tons of pest insects or other small arthropods every year. Spiders are generalist predators that are willing to eat almost any insect they can catch. They are abundant and found in most habitats. They only need to be left alone!" http://www.coopext.colostate.edu/4dmg/Pests/spiders.htm
Sometimes they can be more of a problem at home near water. I suspect this is because there are more insects near the water and therefore more spiders set up shop there. I say that because spiders also seem to be more of a problem near outdoor lights and lamps. Here again, it's likely that the spiders congregate where the food sources are the best.