Jumping spiders are definitely the coolest kind to watch. They're very active and give the impression of paying attention to their surrounding. When they turn their bodies toward you they act like they are actually looking AT you.
They have the best eye sight of all the spider's I believe. Also the 2 large eyes, if you cover them and put an insect in the box with it, They cannot tell if it's predator or prey and will not attack it, so apparently those 2 eyes tell help to identify? They also move all around like a pivot from the inside.
I was watching some show about them. Wolf spider's and Orb weave spider's freak me out the most though.