DiscoStu - 7:01 pm on Apr 14, 2010 (gmt 0)

What do you do when you have a website that updates very often, perhaps several times a day - do you generate a new xml sitemap each time something is posted and upload it to Google (so you upload several new versions of xml sitemaps a day)?

And what about large sites (say 30K pages) that add content. Should the whole xml sitemap be re uploaded each time a page is added?