Microformats Implemenations and Examples

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Drupal Upcoming.org syndication module emits hCalendar
Ryan King has an hCalendar creator and a hCard creator.
iChat buddy list to hCards - Open source AppleScript to automatically convert one's buddy list in the MacOSX iChat AIM client into a valid XHTML 1.0 Strict list of hCards.
rfc2629.xslt now attempts to generate hCard information (RFC2629 is an XML format for authoring RFCs and Internet Drafts, see example document)
The hCard creator is a very simple, yet illustrative, open source user interface / form / script which creates an hCard in real-time as you type in a set of contact information.

The Laughing Squid Calendar events supports hCalendar.
Upcoming.org - hCalendar
EVDB - hCalendar, hCard
LiveJournal - relTag
Sunnyvale House Concerts publishes hCalendar event information for concerts and hCards for each artist.
Complex Spiral Consulting, both in the "Events" box on left side, and the separate Events page.
Tantek's Thoughts publishes Events roll in hCalendar and includes an inline author hCard at the bottom of the page.
Lesser Known Holidays, a list of holidays on suda.co.uk that can be imported via iCal and hCal so you can compare actual transformation versus intended.
Technorati's About page lists their Media Contact, and their Press page also lists their Press Contact, both as inline hCards.
Don Crowley has published his hCard as well as a nifty hCard button:
Rob Mientjes has published his hCard on his about page.
Steven Ametjan has published his hCard on his about page.
Andy Hume uses the hcard format to mark-up the names and URLs of commentors on his blog.

Technorati - relTag, relNoFollow
JSCalendar parses hCalendar and produces a displayable HTML table/CSS-based calendar.
Google - relNoFollow
X2V parses hCard and to produces .vcf (vCard) streams and hCalendar to produce .ics (iCal) streams.