I'm going to take a slightly different approach to this and focus on revere, since that appears to be your location. also, 2 types of answers ... first, a 'market snapshot' of active properties (single families) on those 3 dates, shows the inventory and avg. prices; second, the actual 'solds' in the last three 6-month periods. here goes:
11/9/07 - 181 active listings, 135 avg. days-on-mkt(dom), $340k avg.price
5/9/07 - 168, 115 dom, $365k
11/9/06 - 160, 103 dom, $363
5/9/07-11/9/07 - 80 sold, 148 dom, avg.sales price $293k
11/9/06-5/8/07 - 93 sold, 118 dom, $309k
5/9/06-11/8/06 - 102 sold, 118 dom, $351k
obvious trends: today, more inventory, fewer sales, longer dom, lower prices.
hope that helps ... good luck!