The Data Slider widget is pretty darn slick. What makes this Date Slider unique is that it is design to show a bar graph of results and you use the slider to narrow down to a specific date range. You could then use the selected range to zoom in on the data, or maybe show a detailed report history from that time frame. Here's a screenshot:
Adaptive Path is using this control on their Measure Map product, which provides free blog statistics. This control is used to show you an overview of the number of hits during a time frame. They use the Date Slider widget to allow you to narrow down your results. Pretty darn slick!