I know the typical good fats, PB, flax seed, almonds. What are some other good fats to include in my diet?

Extra virgin olive oil is a good one to add. Put it on a salad, toss it in some soup, or just use it as kind of a dipping sauce for whatever else you may eat (really adds some great flavor to grilled chicken in my opinion)...tasty stuff and extremely high in good fats.
You could also get a Fish Oil supplement (EPA/DHA) if you don't have one already.
Although "good fats" such as olive oil and nuts are fantastic. Don't neglect saturated fats. They certainly have their place in a healthy diet, especially someone who is trying to add muscle.
http://www.westonaprice.org/knowyourfats/index.html
1 whole egg has ~1.5g of sat fat. That's a lot of eggs to eat to get a good amount of sat fat.
M.Ed. Ex Phys