This group of CommunityGeek members below worry me.
They're the members that are starting to drift.
They haven't visited the community in over a week. They might be on holiday, but it's likely they're drifting.
The 'starting to drift'ers is a category that doesn't fit neatly within the lurker to regular continuum. Yet, these are the very people you still have a chance to save. They're drifting because the community doesn't rank high enough on their list of priorities.
The easiest thing to do is to contact them directly with a question from another member they can help with. You can be aggressive in this. You can have volunteers help you.