reviving what was once dead...
How many times have you scrolled down in the forums to catch sight of a title that seems vaguely familiar? How many times have you seen a once familiar author's name on a list of articles only to discover later that the article was written eons ago?
I can't say that I hate rediscovering old articles. In fact, I rather enjoy re-reading good stuff, and later pleased to see the responses of bloggers from long ago. It piques my interest to find out who actually brought an old article back to life. Was a newbie who is digging back into the files of a now-favoured blogger who just had to comment about something that moved him? Is it an old blogger desperate for attention, waving a sign saying 'look at me, I'm still here!' Sometimes there's no clue whatsoever, not by the responder, nor by worthiness of the aforementioned article. Occasionally a revived article is just a bland, inconspicuous peice of writing; nothing outstanding or noteworthy there.
It's my guess that zombie blogs appear when the state of the forums seems a bit stale. People tend to go digging for quality stuff. Reknowned bloggers are re-read, and gems are unearthed. Sometimes old wars are focused apon, other times people's personal libraries are perused after writing a cleverly worded retort, or writing a moving piece of their lives.
Zombie blogs, good or bad, are a great indication that not everything we write is reserved 'for the moment'. Zombie blogs are a good reminder that sometimes our words leave an impression on people... something most of us strive for, in one way or another.