This is blog stuff, so if you don't care, skip to the next post.
It appears as part of their site redesign, the Powerline guys have eliminated trackbacks. (For the uninitiated, a trackback sends a link to another person's post to show that you've commented on what they've written about.)
Boo! Hiss! Bah!
No comments and no trackbacks? Not very friendly.
I've noticed a lot of Blogspot blogs also don't have trackback. Harvey at Bad Example explains adding the trackback function to your site for various blog software including blogger. If you blog and don't already have trackback, go there to figure it out. You'll like it.
Update: Captain Ed has more on the trackback spam problem MT blogs are experiencing.
Update 12:35: WILLisms has been following this issue all over the blogospere and makes a great point.
For emerging blogs, trackbacks are crucial for cultivating a base of readers, then occasionally reminding those readers visiting the larger blogs to "come home."
But trackbacks have a more important purpose. They allow blogs to engage in "conversation" about ideas, letting people discover new perspectives outside the entrenched mainstream of blogs. And make no mistake, as blogs become increasingly mainstream, without interactive tools such as trackbacks, there will be a handful of mainstream blogs, much like the mainstream media, that set the agenda on their own.
In short: Save the trackbacks!