I'm planning to have a develop build a CMS (in Ruby on Rails) with blogging, advertising and ecommerce integration.
Many types of reports/charts would seem necessary in such a system: Unique viewers, page views, overall sales, average sales, sales using coupon, sales by location, ad impressions, ad click-through, sales by location, top referring links in, top exit links and order issues -- just for staters.
What other types of reports or charts would you recommend including in the system?