Hi, reporting out of SharePoint is going to be problematic. SharePoint can export data directly to Excel or to Access but repeating data is going to be a big problem due to the way SharePoint/InfoPath merge all the data from a repeating field into one field in promoted properties. We have a video about the challenges of SharePoint reporting here. In the video you will also see a demo of how we solve this problem using our proprietary tool called Database Accelerator (DBXL).
We developed DBXL to address the reporting gaps in SharePoint and with DBXL you can "shred" (parse) the InfoPath fields to SQL for easy reporting. DBXL also includes the option to report on that SQL data via an Excel web service method that pulls the data from SQL into an Excel spreadsheet so you can do pivot tables etc in Excel. This Excel web service even will allow you to connect to SQL views from that same SQL DB which is very helpful if you want to do relational reporting on multiple InfoPath forms.
We offer a free evaluation of DBXL here. I would also be happy to talk to you in person about the value proposition of DBXL and some exciting new features coming out in our next version (including a new server version & a standalone client version of the tool). You can contact us via the link here.
Ted