House Hunting All Day, Every Day [truliablog.com] is a relatively simple dashboard that reveals when, in terms of weekday and time, most prospective house buyers are looking at homes for sale (on the Trulia website, that is).
The visualization includes a week versus hourly heat map, in addition to a standard bar graph and pie chart. Accordingly, it seems that most people make house hunting a 'work hours' activity, with most activity occuring between 9 and 5PM (adjusted for time zone differences), with a major down time between 2 and 6AM, except of Washington state (they seem not to sleep there). Searches with mobile devices pick up around 4PM, with a peak at 9PM (so when people leave their work computers). More detailed descriptions of the most important insights can be found here.