I don't know how often you update this, prolly not too often, but you might want to recheck the links.
The All Different Types of Gnomes goes to Tindalorian (enhanced caterwaul)
The All Different Types of Halflings goes to Need a hand with some reviews
Those are the two I encountered. I only looked at about half a dozen of these, so I can't tell you any other links which don't work.
Btw, I really appreciate this list. I just wanted to say that. I've found it quite useful for the occasional thing I need to look at.