Hey guy's had comment on this one. The Brown Recluse does have nasty results from it's bite as well as some other spidres like the Hobo or aggresive house spider. I'd be more concerned with ticks and mosquitos will in the woods though.
If anyone is concerned about these spiders being in their house buy some sticky traps and place them under furniture and other dark areas thats not disturbed often (hence the name Recluse). Check the traps after about week if they are in the hous you'll catch some on the traps.
As far as treatment just spraying will not uaually take care of a Recluse infestation in a home since the Recluse usually will not come in contact with the insectcide unless it's applied in the areas where the spiders are and most people tend to spray baseboards. Treatment is best done by a proffesional who knows the biology and habits of the Recluse.
Heres some more info.
http://www.hobospider.com/info/

Bug
Bugman by trade