I've never really thought about this, but we've been a community for some time now and I'm not sure why a conversation needs to end just because the day, week, month or even year has changed? Most of the original hubskiers are still around. So I guess my point is, why not dig back in to some older posts to find conversations and light a fire under them?
You could even start at #1 and work your way back.
edit: Here is a link I just mentioned to littlebirdie that I think would be worth exploring: What's on your bucket list?
As for how much time I'm on Hubski. -I dare not consider :)