Indie & Viral Games
Non-commercial art games and hobbyist remixes sometimes capture the collective interest of online gamers.
Since we have already covered this as part of a student presentation, I encourage you to participate in and further the discussion; I don't feel I need to assign additional readings.
I should point out that Adventure, 9:05, and all the IF games you sampled also count as indie games -- with the exception of "Hitchhiker's Guide to the Galaxy," which was originally released as a commercial title.
One thing I will mention... Farmville.
What do you feel about games that integrate with social networks to this degree?