incrediblehelp, the IBL's for the specific site in question are not so good at the moment.

I downloaded gsitecrawler today to see how it crawls the site and it reported the last modified date of each page as today's date. That made me wonder, Google probably receives the same dates, so there is no quick way of telling which pages got updated recently, so do you think it will help by adding the dc.date.x-metadatalastmodified tag to each page and have the sitemap updated with these dates?