We operate a ad management and campaign platform. We have quite a advanced reporting platform, but the charts are currently all generated into flash. We have the standard excel, cvs, xml export options but we feel we should offer more.
Recently I saw a plugin to MS Office, where the user was able to generate standard and customized reports directly into office applications (e.g. MS Word, MS PowerPoint and MS Excel). Charts where deliverd into the MS Office metafile charts (so able to ungroup and manipulate). MS Excel had various sheets with various charts and tables.
We can imagine a plug-in for MS Office where the user has to enter their account ID, Username and Password and then get's access to a number of standard reports to choose from and directly import and/or has the option to specifiy some specifics like data range, campaign or site and from their have the graphics.
Our platform generated the current chart using XML and a lib called SWF/Charts ([url removed, login to view]).
Another possibility could be that the application is server side (so we add the MS Office export button to the reporting screens of the ad server) and from there you can export nicely designed reports into MS Office and manipulate there when needed.