"Iterate" is a software tool for the ExtremeProgramming PlanningGame. It provides digital versions of StoryCards (DigitalStoryCards), as well as charts and reports based on those cards.
Iterate, the product: http://www.diamond-sky.com/products/iterate/
Diamond Sky, the company: http://www.diamond-sky.com
Update 2008-09-16: The product is no longer available, as indicated at http://www.diamond-sky.com/download/
That's one more advantage of physical cards or open source software tools: availability.
I love how if you click on their Products link, Iterate Expert edition shows up, with the tagline, "For when index cards are exactly what you need." I got a good chuckle out of that one. Still, you cannot blame them (him? her?) for attempting to build their/his/her (as appropriate) own company/career by riding a definite trend in the market (at that time, at least). In a way, it's kind of sad.
Part of ExtremeTools
See also DigitalStoryCards