I've re-tagged two of the blogs I track with "inactive-blog." This moves them off my blogrolls in the sidebar.
I try to go through the blogs in my list each month. As a general rule, those that have been silent for a month are removed.
I am sorry to see that Tim Slavin has stopped posting to his blog. I thought it was an interesting experiment in blogging by an elected official. The other inactive blog is DelaVision, which ironically fell silent after bragging about how the long-silent DelaVoice now redirects to DelaVision.
Now that I'm managing the blogrolls with del.icio.us, it should be easier to recheck these blogs and re-add them if they wake up.