We have both brown and black widows down here. I leave them alone, and they leave me alone. Widows don't spin traditional "Charlottes" webs, but rather a random set of intersecting strands that are much stronger than other webs you find. They will set up a nesting area near a good food supply zone and you'll see a cluster of 3-4 spiny egg sacs which are visciously defended by mama. As long as they don't nest in my jack stands I'm cool with them. Widow bites can be a problem for the weak or young, but an adult not so much.
What is really cool, is we have very large wolf spiders hanging around the shop. The presence of wolf spiders is a good thing. They stay on the ground, don't spin traditional webs you walk into, and keep the nuisance bug populations in check. Although they are considered venomous, the bite of a wolf spider is akin to a wasp sting and they are really not a threat to human life. They stay hidden until they are after something, so it's not like they are stalking us or anything. They only attack stuff they know they can kill and the rest of the time they run like hell to hide from you. Smart little buggers.
I'm kind of an amateur "arachnologist" of sorts, and think of spiders as my allies rather than something to fear. Wolf spiders will attack and kill the junebugs, any roaches or fire ants, and being very territorial, will attack and kill any other wolf spiders encroaching on their territory. About three months ago, I captured a very large female after she was seen zipping across the floor to attack a wayward mole cricket. About 3.5 inches across, she was about the largest one I have ever seen around here.
I carefully scooped her up and placed her into a half-gallon beta-fish tank and kept her as a pet. Providing her water and a supply of fresh bugs for food, she eventually gave birth to a marble-sized egg sac which she carried around for about 4-5 weeks until her young hatched. Once the babies emerged, all 100 of them climbed onto mama's back where she carried on feeding and providing water for them. It was cool to watch when I would take about ten sheets of TP folded and soaked with fresh water and place it into her tank. She would walk over to the wad where the babies would all file off for a sip then crawl back onto mama. Cool stuff.
Anyhow, after wifeypoo had about three days to think about the potential for a population explosion in the shop, I was strongly encouraged to let her go. I carefully released her and the young into the wild again in a small grove of trees and bushes near the property line. I know mama and a few babies will eventually make there way across the back yard and into the shop in search of shelter and food once again. She will be welcome, as I'm fascinated with these creatures.