Here are some great White Papers written by Sanjay Soni:
 
Performance Study of Microsoft Data Mining Algorithms (Microsoft SQL Server 2000 Technical Articles)
Get an introduction to the Analysis Services API for OLE-DB. Topics include, decision tree and clustering algorithms, basic data mining terms, and a performance study of the two Microsoft data mining algorithms with synthetic data.
http://msdn.microsoft.com/library/en-us/dnsql2k/html/sql2k_analysisdm.asp
 
Analysis Services: Optimizing Cube Performance Using Microsoft SQL Server 2000 Analysis Services (Microsoft SQL Server 2000 Technical Articles)
This paper discusses the design and implementation of a series of test scenarios that include building and querying cubes using Microsoft SQL Server 2000 and Analysis Services.
http://msdn.microsoft.com/library/en-us/dnsql2k/html/olapunisys.asp
 
OLAP Distinct Counts and Performance Analysis (Microsoft SQL Server 2000 Technical Articles)
Learn techniques to answer useful Distinct Counts business questions by using the Sales and Marketing scenario and Analysis Services 2000 to learn about performance characteristics of Analysis Services 2000.
http://msdn.microsoft.com/library/en-us/dnsql2k/html/sql_olapdistinctcount.asp