A friend of mine passed along this blog series over at Insult Swordfight. It's about coming up with gamer definitions more accurate than simply "casual" and "hardcore". I found it really interesting so I thought I would share the link here, with anyone who stumbles across it.
Here is a quote from it to give you a taste for what he was trying to achieve with the series.
Employing this new taxonomy, we're able to discuss games without resorting to a simplistic rubric in which games either suck or rule. And we're able to see gamers as a lot more than simply hardcore or casual. Instead of talking past each other when we're coming at games from fundamentally different perspectives, we'll be able to seek common ground and at least disagree with one another from a place of understanding.