Sites like Linked.com in use them. I notice that if I search for myself on Yahoo: http://search.yahoo.com/search?p=Pau...java+developer
The very first result is me (even has my picture) , well, my linkedin profile anyway...
So, they are clearly using the microformat data.
The microformat data seems like a great way to help users of search engines. And if it helps users, that means higher quality targeted traffic. This could be good for site owners and our visitors.
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it seems that flickr is using microformats as well...
I come first under Yahoo when I research my name and SEO, or my name and Marketing etc....it's always my Linked In profile that shows up too. Same thing under Google.