Via Pharyngula we get this great article written by a guy who found a brown recluse in his house, complete with close up pictures and detailed descriptions. Also note the comentary on gila monsters, and a claim that apparently daddy longlegs don't have the worst venom in the world as is often said.
Normally I don't kill spiders. They do me plenty of favors killing unwanted insects, and generally leave me alone. But for brown recluses I'll make an exception. Those that have been bitten by them don't soon forget the experience.