RadarCube ASP.NET for MS AS by Radar Software

The RadarCube OLAP Library provides the ASP.NET programmers with a unique chance to supply your web site with the MS Analysis 2000 or 2005 OLAP client abilities using the set of web controls. The Library is entirely authored in C# 2.0 and greatly exceeds the functionality of the PivotTable and PivotChart ActiveX components being a part of the Office Web Components set.

More information here: http://www.radar-soft.com/products/radaraspnet_msas.aspx