What is up with these spiders? I found this guy running across the floor tonight, scared the crap out of me. I proceeded to vacuum him up with my shopvac only to have him escape and run across the floor again! (or it was another, identical spider?)

I it is pretty menacing looking and I have no idea what it is. Kind of looks like a Wold Spider but I've never seen a completely black one. This one kind of looks like one of those fake plastic ring spiders.