The vertical sandbox genre has gotten two meaty steroid shots with the recent releases of inFamous and Prototype. For those who would prefer a little history lesson on the genre before jumping into these recent releases, might we suggest playing Crackdown or Spider-Man 2. Both titles are clear inspirations for the latest games and can likely be found at a budget price.
Also, could someone give us an idea of how to block the Crackdown narrator from popping in our head and saying "Skills for kills, agent. Skills for kills" after every major inFamous and Prototype battle? What's everyone playing this weekend?