Don't resurrect old topics. When people stop posting in a topic, it's usually a sign that everything of value has been said. Thus, if nobody's posted in a topic for more than a week or two, consider it dead and don't post in it (unless you have an important follow-up or question exactly on-topic, and the topic is still recent). If you post just a comment on something somebody said ... chances are no-one will care because it's been a while since everything was posted.
Not to be mean or anything but