TurboTax's online tax prep software does this. You can just click the Next button as the slider animations slowly fill up. Maybe this comment will save someone else some time this year :)
Having sporadically just done my taxes last night, I've gotta' say, I'm a fan of TurboTax. Probably the best website experience I've ever had. I can't recall anything else that knocks it out of the park on aesthetics, function, latency, UI etc like it does.
