I’ve been working with WordPress for clients since 2005. I’ve designed templates, got stuck in a ton of black holes myself, and managed some pretty nifty projects that took WordPress in some novel directions.
I talk, like, all the time. Total attention whore. Plus people get me to do it about big important stuff sometimes too. This one time, at WordCamp, I did a talk on WP as a CMS, and Matt liked it. (well, he said he did.)