Tremendous shout-out to Travis McLeskey, creator of AllDaySamples.com. Lots of folks started identifying the list of samples in All Day as soon as the album was released, but in creating AllDaySamples Travis undertook the heroic quest to work out all the start and stop times of those samples. As far as I can tell, until now AllDaySamples has been the only public source of stop times, which are essential for making any visualization look good.
With Travis's agreement I've integrated those stop times into the All Day page on Wikipedia, and so going forward Wikipedia will be the default data source for Mashup Breakdown. Already others have started refining the data, and you can see the most up-to-date version by choosing "Wikipedia (live)" as the Sample Info source.