Hey Jeff. You definitely can. I recently got it so I could share my
feed growth details with my readers. When you log into Feedburner, go
to the "analyze" tab. Beneath "Uncommon Uses" on the left, you should
see:
Export: Excel • CSV
Download the CSV file to your desktop, then open in it Excel (or other
spreadsheet program).
From there you can make a graph, etc. The file contains data going all
the way back. If you get stuck, shoot me an e-mail.
Dereck