One digitally reliant genre that bears relevance to the work of some humanists is Alternate Reality Games (ARGs). Jane McGonigal's work and installations are one place to start if you'd like a quick grounding, since she co-designed several major ARGs (see "my games" and "my research": http://www.avantgame.com/

Another is interactive fiction, which is not new at all insofar as ADVENT (Adventure) was programmed in the 1970s: http://ifwiki.org/index.php/Adventure IF had a renaissance around the late 1990s, however, after Infocom (the company that produced Zork) was acquired and killed off, which is what might make it relevant here as "new." Again, for a quick grounding one could do worse than to start with Emily Short's how-to page, with links down right-hand sidebar: http://emshort.wordpress.com/how-to-play/

See also Nick Montfort's work, esp. the "IF" link in the left-hand sidebar: http://nickm.com/

Short is (the pseudonym of) a classicist. Montfort's monograph, <i>Twisty Little Passages</i>, cites the riddles in the Exeter Book as amongst IF's precursors. IF as a form is distinct from much of the "hypertext" activity, by the way, though some practitioners cross over.

For GPS, try searching on "geocaching" and "KML" (keyhole markup language).

(Also, I might suggest using "simulations" rather than "SIMs," especially if you plan to use Second Life and Doom as examples for it. I'm used to seeing the EA / former Maxis games--from SimCity and SimEarth through The Sims--called simulations, whereas Doom is a first-person shooter. Second Life is a virtual world, near kin to MMORPGs like World of Warcraft. :) Your mileage may vary, of course, as we used to say on Usenet!)

Cheers, Sharon