Once you setup a site and it starts getting traffic there would come a time when you get curious as to how many users are
Session topic: Dashboard solution for SharePoint Online using HighCharts, custom views, KPI columns and Nintex for Office 365 apps. “Your organization uses Office 365 SharePoint
Here is a great idea for dashboards for SharePoint 2010 tasks list or any list for that matter. http://blog.netnerds.net/2012/03/sharepoint-2010-creating-dashboards-and-charts-for-sharepoint-lists-using-performancepoint-and-excel-services/
Here is a list of Microsoft BI Demos. http://smartdatacollective.com/Home/18178 Have fun BIing!
Issue: Unable to pass NULL value to the parameter of a report through URL from .NET code. Solution: In the url add the parameter isNull