OLAP PivotTable Extensions is a really cool free add-in for Excel that’s been around for quite a while now. It allows you to have some exposure to what’s going on under the covers (Among many other features) while you browse a cube using an Excel PivotTable. This weekend there has been an updated version and you should check out the features and download it now!
http://olappivottableextend.codeplex.com
The new features in this release are:
- Support for Excel 2013
- Upgrading to the AS2012 version of ADOMD.NET to now support connections to .bism files. (This upgrade required adding the .NET Framework v3.5 SP1 as a prerequisite. Use a prior version of OLAP PivotTable Extensions if this prerequisite is a problem for your organization.)
Devin Knight 
it’s interesting extension