For those of you who haven't heard of rich snippets, it essentially involves inserting special data into HTML markup that describe content on the page. The benefit would be really neat looking search results on Google.
For example (and this is just an example), my Stack Overflow profile might look like:
Microdata is probably the easiest and looks something like this:
<div itemscope itemtype="http://data-vocabulary.org/Person"> <b>Name:</b> <span itemprop="name">George Edison</span><br /> <b>Homepage:</b> <a href="http://www.quickmediasolutions.com" itemprop="url"> QuickMediaSolutions.com</a> <b>Type:</b> <span itemprop="title">Regular User</span> </div>