From: http://www.ablognotlimited.com/articles/oomph-microformats-toolkit/
 
For hCard microformats, the jQuery aggregator doesn't grab the right information for email link (<a class="email">) in an hCard. It appears to pull the content that displays on the browser, rather than the href="mailto:" value.
 
So, if you have something like this in your hCard (which I do):
 
<a class="fn email" href="mailto:emily@ablognotlimited.com">Emily Lewis</a>
The jQuery hCard aggregator grabs "Emily Lewis" as my email address, rather than "emily@ablognotlimited.com".