Very good overview article: "Microformats: Digging Deeper into the Web" by @BenWard http://j.mp/ufdeep. Minor errata: I was @Microsoft (not yet @Technorati) in early 2004 when I coined the term "microformats" and @KevinMarks (then of @Technorati) and I invented/presented it at O'Reilly's Etech conference: http://tantek.com/presentations/2004etech/realworldsemanticspres.html. Later that year I left Microsoft about a month after the "Great Web Schism" W3C meeting at Adobe, and joined Technorati. longlink to @BenWard's article: http://web.fumsi.com/go/article/share/62328