I am probably the last person to discover this, but The IMDB has added teeny little pix next to the actor's names on their show pages! Take a look:

(chosen not-so randomly)

Stargate Atlantis, ep "38 Minutes"

Battlestar Galactica, ep "Flesh and Bone"

Not everyone has a pic, they're clearly using the 'headshot' from the actor's pages and not every actor has put one up, but still, it's a cool feature.