As a follow up to this post, I now have real numbers from IPR...

So... End Q4 2008: 1017 total sales.

End Q1 2009: 1250 total sales.

Direct: 28 books
IPR: 124 books, 31 PDFs
OBS: 50 PDFs
Total: 152 books, 81 PDFs [Total: 233 sales]

For a lifetime of 641 books, 609 PDFs [Total: 1250 sales].