I found a great tutorial on a double slider card at http://hungryheffycrafts.com/2010/04/double-slider-card-tutorial/
I decided to make a Silhouette Studio cut file to make the card. Here is the link for the file. http://www.4shared.com/file/TqzCT023/Double_Slider_Card.html
Download the file, cut out the pieces and then watch the video on how to put it together. I love that this card opens like a regular card but has the additional double slider. That way you can stamp/decorate the sliders and still have tons of room on the inside of the card to write a message.
Hope you enjoy and thanks to Lesley Oman of Hungry Heffy Crafts for the tutorial and inspiration.