Yes, that is a Goliath Bird spider. Misnamed for it doesnt really hunt Birds, aside from the chance happening. Mice, Rats, Lizards Etc are all items on its regular Menu. I will look to se If I can find any other pics to give a really good Idea to the size of this Spider
While the GBS is Impressive in its size, Its relativly harmless to people.
One to worry about, it the Starburst Baboon Tarantula. This one is an aggressive little bastard that will bite the Holy hell out of you. Hurts Like a holy Hell, makes you sick as crap..... Not really deadly Unless you happen to go into Anaphelatic<sp> shock.