I'd be interested in knowing what he used to create these graphs, and if they have a special name.
It's a form of cohort analysis, and I've heard the graphs called "Cohort Revenue".
It's pretty simple to construct - you can download the Excel file I used at http://www.filedropper.com/churn
EDIT: I downloaded the cohort data for my SaaS from Recurly and injected all this into a google spreadsheets. With maybe 10 minutes of work I had my data, and it's pretty good. Thanks again :-)
I just made our cohort graph yesterday in keynote, based on data exported from Stripe.
The input for the graph is a very simple table. One row for each cohort (or colored bar in the graph), and one column for each month in your timeline. In the cells you simply put the amount of revenue you earned from customers in each cohort in that month.