Bibliography, bit late but hey its here! :P

Book items.
Braithwaite, B. & Schreiber, I., 2008. Challenges for Games Designers Non-Digital Exercises for Video Game Designers, Boston: Course Technology.

Trefry, G., 2010. Casual Game Design Designing Play for the Gamer in All of Us, Burlington: Morgan Kaufmann.

Contributions
Corneliussen, H.G., 2008. Digital Culture, Play and Identity A World of Warcraft Reader, Rettberg, Walker J. Cambridge (Mass.): MIT Press.

Wolf, M.J.P., 2003. The Video Game Theory Reader, Perron, Bernard,. London: Routledge.

Articles
Venturelli, M. 2009. Space of Possibility and Pacing in Casual Game Design: A PopCap Case Study. VIII Brazilian Symposium on Games and Digital Entertainment.
Anon, Playstation hack: timeline of huge security breach. Telegraph.co.uk. Available at: http://www.telegraph.co.uk/technology/sony/8495072/Playstation-hack-timeline-of-huge-security-breach.html [Accessed May 5, 2011].

Anon, Samsung to launch Chrome OS laptops at Google I/O. Telegraph.co.uk. Available at: http://www.telegraph.co.uk/technology/google/8493947/Samsung-to-launch-Chrome-OS-laptops-at-Google-IO.html [Accessed May 5, 2011].

I think these are all correct havn't really used Zotero too much before.