I just go back page by page and I remember where I left off from the day before. I also usually have a post open that says "who wants to trade" or something similar. That way I know where the old ones start and the new posts begin.
For my personal question list, I just try to close them as soon as possible. It does get confusing if someone takes more than 3 days to answer though. Basically, if someone hasn't answered and it's been between 3 days since they've been online, then I'll ask someone else to answer them. If they come back shortly after that and ask where the posts went (I've had this happen), then I just repost them.
at 11:18 AM on Mar. 18, 2011