Microformats allow you to mark up code so that it is accessible to other programs and services.

An obvious example is to use the hCard microformat to write your contact information.

More information from the links below:

http://microformats.org/wiki/Main_Page

http://microformats.org/code/hcard/creator

Here is an example of the code:

<div id="hcard-Trevor-Smith" class="vcard">
<span class="fn">Trevor Smith</span>
<div class="org">Beanbox Company</div>
<div class="adr">
<div class="street-address">1508 Ridge Ave.</div>
<span class="locality">Muskegon</span>
,
<span class="region">MI</span>
,
<span class="postal-code">49441</span>

<span class="country-name">USA</span>

</div>
<div class="tel">(773) 710-7896</div>
<p style="font-size:smaller;">This <a href="http://microformats.org/wiki/hcard">hCard</a> created with the <a href="http://microformats.org/code/hcard/creator">hCard creator</a>.</p>
</div>