Short version: I'm on twitter now: pjcozzi.
I remember when I first learned what a blog was back in 2000. I was an intern at Intel, and stumbled across Joel's now famous blog. The first post I read was The Guerrilla Guide to Interviewing. After that I was hooked, and followed Joel almost religiously until 2006 or so. I kept following after that, but not as frequently (maybe grad school had something to do with it). At the start of 2008, AGI launched a blog for Insight3D, and I wrote my first blog post. I also started reading dozens of graphics blogs, many of which are in our blogroll.
Since then, I've gotten use to the idea of writing blogs to share technical ideas or products news, so it was natural to launch this blog for our book. During all this blogging, I somehow managed to ignore twitter. Clearly, I was missing out, so I'm on twitter now: pjcozzi. All I need to do now is make a LinkedIn page and I'll be completely connected! Maybe once the manuscript is done...