Hmm, so still no tweets on blog posts. Turns out there’s a bunch of folks having the same problems with twitter-tools. Just noticed that my Dreamhost config for this domain was still saying php4 (even though calling php_info() from a script in this domain reports v5.2). I flipped that switch, but I doubt it will help. I guess I’ll stab around in the dark some more until someone makes a debugging breakthrough.