I am not sure exactly what the deal is with that. They are all coming from the same ip address range so I am not sure what to make of it. I don't think it's legit guests but probably search engine spiders or something. I haven't quite figured it out yet.
Do you have your hotlink protection turned on or off in your control panel? If there is a picture here and someone hotlinks it, they will appear as a guest. Also Firecoachfulmer.com is down and it could be the folks from over there checking you out.