today,i attend a training on Proclarity,as you know,proclarity now is a subsidiary from Microsfot,it provides a set of tools for reporting and analytsis you data.
if you have so much data,you need not just a reporting tool such as Crystal Reports or SQL Reporting services,you need to analysis your data to be more describtive and realiable for all decision maker in your company.
use the following link,to know what's BI ? How to start? Features of Proclarity as well.
Resource center for BI in SQL 2005