http://www.hingepoint.com/products/bom-revit-app/

BOM to Excel – Reports, Tables, Quantities, A Revit App and Plugin with Results Guaranteed, Literally Guaranteed. Or your money back. This amazingly powerful productivity plugin will save 100’s of hours in Autodesk® Revit® BOM data analysis, reporting and quantity estimation. Create clear BOM reports beautifully formatted and exported instantly to Excel for professional team and client uses. Available in both a trial and paid versions so you can try before you buy.