I think you can extend this argument to say that even sites do not need sites map as crawlers do eventually crawl all pages.
But if you want your contents indexed withing minutes of posting it, you need Google site map
Nops, not realy Temi.. Because the structure of Blog system is different from the structure of a website. The latter needs an indicator for crawlers to properly index them, hence a sitemap.
@SkinnerW:
John Chow, Darren Rowse..etc
I still maintain that a sitemap is not necessary for a blog.. but necessary for a non-cms website (except if you have a blog which is updated once a month)