search engines - Microformats Wiki

Search engine implementations that index microformats across the web (i.e. not just on their own site).
General web search. Search engines that index websites in general using microformats.
Google.com supports rel-nofollow, hCard, hReview, hReview aggregate, hProduct (since 2009-05-12 for rich snippets), hCalendar (since 2010-01-22), hRecipe (since 2010-04-13) - in main search. See also related blog post on hCalendar hRecipe support and hMedia (since end of 2012).
Through additional interfaces Google supports rel-license ( Google Advanced Search - Usage rights), and XFN (e.g. rel=me support). See google-search for more details.
Microsoft's Bing.com supports hCard, hReview, hReview aggregate, hProduct, hCalendar, and hRecipe in main search, per Bing Help: Marking up your site: Overview.
Yandex supports hCard, hRecipe, hReview, and hProduct([1]) and has a microformats validator as well. See yandex-search for more details.
Some search engines (or search engine backends) are no longer up and running, but when they were, they supported microformats:
Yahoo search supports rel-nofollow. Through additional interfaces, Yahoo supports rel-license (Yahoo Creative Commons search) and hCard, hCalendar, hReview, XFN, geo, rel-tag, adr through Yahoo Search BOSS and Yahoo Search Monkey. See yahoo-search for more details.
Search blog posts and blogs in general. Search engines that specifically index blogs, blog posts, and other realtime sources on the web using microformats.
Search engines that publish microformats in their results (but may not necessarily be indexing microformats).