The good news: I finally was able to determine which species of spider I killed yesterday, and they apparently are not poisonous nor are they known to be aggressive (unlike myself, who was beating the heck out of it with my sandal).
The bad news: I saw an even bigger one this morning in my basement (which is not the creepy sort of basement, but rather a nice finished basement) and was unable to kill him as well before he ran under my dryer. And I mean bigger as in probably about 3 to 3&1/2" in diameter. These wolf spiders (as I determined them to be based on a picture that looked exactly like our former friend from yesterday) are apparently known for their large size. No kidding. I can vouch for that.
I have the most severe case of the HBJ's* that you have ever seen right now, and I'm definitely starting to rethink my love for rainy, cloudy days. If I see another one of those large suckers creeping across my floor, I'm packing my things and heading to Oregon.
*For those of you not in the know, "HBJ" stands for the heebie jeebies.