A well-written, in-depth article. Schaffer the Darklord wasn't mentioned, but he raps more about general nerdy things, like an entire song about Craig's List, or one devoted to grammar, than video games. One of my favorite non-YTC nerdcore lines about games is from Beefy/The Grammar Club: "Well let me see ya crouch, crouch forward, walk a little, then punch / Serving all these kids hadoukens for lunch."
Anywho, my favorite nerdcore artist is definitely YTCracker, and for those interested, you can get his EP "NerdRap Entertainment System" for free, here: http://www.ytcracker.com/nes/ I just love how well he works video game allusions in, especially in "N.E.S.", which is basically a giant string of video game allusions, and the entire album should not be missed. If you want to buy a YTC album, I'd recommend "Serious Business", more specifically the song "I Am A Pirate": "Smoke, drink, hack a computer / Drink, smoke, first person shooter", and more odes to being a digital pirate, over souped-up versions of the Pirates of the Caribbean theme.
So, yeah. Nerdcore is pretty cool.