Notice the inspired touch of the black circles to trace the outline of Blackberry's market share. They are a guide to experiencing the chart.
I wish they had put the Palm section above Blackberry. In an area chart, the only clean section is the bottom section in which the market share is not cumulated. Given the focus on Blackberry, it's a pity readers have to perform subtractions to tease out the shares.
I also wonder if the black circles should contain Blackberry's market share rather than the year labels.
But I enjoyed this chart. Thanks for producing it.