The December 2011 Cumulative Update for SharePoint 2010 further improves the iPad SharePoint BI experience. The SharePoint Product Team Blog announcement was made on December 19, 2011. With this cumulative update, users can better view Microsoft BI artifacts on iPad devices running the iOS 5 Safari browser. What works with iPad: Business Intelligence Center SharePoint sites, interactive Dashboards, PowerPivot Reports, Excel Services Reports, Reporting Services Reports, Scorecards, Analytic Charts and Analytic Grids. Here is a good blog post with SharePoint Project Server BI on iPad: http://epmsource.com/tag/ipad.
Here is a TechNet article http://technet.microsoft.com/en-us/library/hh697482.aspx that provides the iPad viewing, best practices for navigation and configuration details. I will post a presentation on this topic in March 2012.
***Note if you have stand-alone SSRS Reporting Services reports you want to use in iPad, check out the MobiWeave SketchMD! app: http://sketchmd.com/Products/bi.aspx