I was just asking myself this same question. While I'm sure most of the comments below work just fine, I'd like to add my solution as well.
I just separated the "values" by a comma, and have a single "value" related to the key in my hash.
When I read out the key value, I'll just do a split on the value in order to break it up in to the individual data points I need.This is simple, and very readable/easy to understand for someone who is not quite a perl monk like me.
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>