This is a lengthy full-play demo of Subversion, which is probably the most exciting video game release of the next year:
World of Love 2010: Chris Delay from Mudlark on Vimeo.
I also recommend checking out the Subversion Design Diaries at Introversion’s website.
And if you haven’t played their first game — Uplink: Trust is a Weakness — then you’ve been missing out on the best hacking game ever made.