Hello Everyone,
I like to check in often to see what's new, especially the forum discussions. I've noticed that on many occasions there are X users, X guests and 1yahoo spider signed in. So for the question that no one wants to ask; What is the yahoo spider? Remember, there are no dumb questions except the one not asked.
Randy, the Dinosaur Soup Man

It's just one of the search engines crawling around the site Randy, you'll also see Googlebot and others from time to time.... That's how the search engines gather their data. Nothing to worry about, it's perfectly normal.