That said, I actually liked today's strip. "You're a tool!" made me chuckle. I wonder if this will be a storyline about 4th ed D&D and the edition gap between gamers. One can hope, it's been awhile since we've had an arc that involved something nerdy.
Nerd fact of the day: My understanding is that power cards were pretty common in 2nd ed, mostly for spellcasters. And speaking from experience, whenever my friends and I were playing, anyone with a spellcaster usually had a notebook or something for their spells. It was just practical.
Nitpick 1: Without "3x5", Cole's dialogue flows a bit better in the first panel. I don't think it's necessary to specify the size of the index card.
Nitpick 2 : 4th panel, there should be a comma between roleplaying and you. "We're still roleplaying, you dork."