It would be nice if we had some indicator on the page that gave us an idea of how "hot" Stackoverflow or another trilogy site is at the current time. This could be based on how many answers/questions/edits/whatever happened in the last hour, or whatever.
I personally would like to know when more questions are being asked so I know when I have the opportunity to see more and learn more. note: I originally thought I should only ask or answer questions at peek traffic intervals, but the more questions being asked, the quicker yours slips off the list, and the more people on, the more competition you have in answering questions, so traffic isn't always a relevant factor in SO usage. This feature wouldn't be of interest to everyone, so it could possibly be a preference.
If SO chooses not to implement this feature, it would be great if they could give us some of the specific day-to-day and hour-hour traffic statistics , so we can make a greasemonkey script that tells you how "hot" the specific hour you are one statistically is.