I do wonder about linking up your book with something the agent represents. Perhaps the agent represents a book that is similar in some ways to yours--and because you researched them and know this, you are querying them. I've read this is a good thing to do--is it?
Yes, this is generally a good thing to do. It definitely won't hurt and it might help. However, we still only care about your writing, so you could say you personally know every single author on our list and it wouldn't help if you don't know where commas go.