APIs
I love websites that have lots of data and provide an API for a way to mine the data. Recently I’ve been playing around with iTunes U API for reporting data to build into charts that have data no more than 24 hours old (because of restrictions on the iTunes Content Caching System). I will say that it’s way easier to export data, put it in your database, and run your own custom queries than trying to work off an Excel report, or use somebody else’s idea of how data should be displayed. Information at your fingertips, but also information how you want it.
edit: changed CDN to Content Cashing system. (Documentation)