You may have noticed that I've trimmed the blogroll down some. Doesn't mean I have any problems with any of the blogs I removed. It's just that the blogs I took off no longer post about things that interest me. In some cases that's cause they changed; in other cases I've changed. And in a couple of cases the blog simply disappeared without warning. (Or at least I didn't see the warning.)
Anyway, my blogrolls are predominatly about what I want to read. I realize that some people put together blog lists in order to highlight people they think need more attention, but I doubt that I have enough traffic to make a difference. I use my blogroll to be easily able to find what I want to read. If I no longer want to read it, it's probably time to take it off.