Epiphora: Spreadsheets. Spreadsheeeeeeeeeets. Spreadsheets! I use OpenOffice because it's free, then I do something kind of awesome: I keep my most important (and oft-edited) files on Dropbox. I have my "ads" and "ad payments" spreadsheets, my "affiliate programs" and "commissions" spreadsheets, and a few other useful documents you might be interested to hear about . . .