Thank you all. I was given a warning that personal blog links are fine only if they include a link back to DIS in a prominent place. I wasn't willing to do that, so I removed my link here.
It seems to me that the enforcement of this rule is a bit selective. Commercial sites are prohibited, but I still see some of those in signatures. I also noted some other personal blogs that didn't have a DIS link back in a prominent position, but it is what it is.
I put that message on my signature to explain why the blog isn't there anymore, and with the notion that perhaps anyone who was curious enough would do a quick Google search to find it.
My guess is that DIS folks want the reciprocal link for SEO purposes, which apparently was important enough to merit a warning.
If this is what people have to complain about, I suppose it makes me feel much better about my own life.