I've smoked it a few times in moderate doses, which gives a short fairly intense high. Absolutely nothing like weed experience wise. It is trippy stuff, not really a party drug. I have never done shrooms or LSD, so I can't compare it to those for you.
I got mine from <a href="http://www.sagewisdom.org/salviashop.html">The Sage Wisdom Salvia Shop</a> which is run by Daniel Siebert, who is the Timothy Leary of Salvia Divinorum.