If you want to get up to speed with Analysis Services 2005 then the following resources may be of use:

Learning MDX Books

The first book, Fast Track to MDX, is an excellent starter and learning guide. The second, MDX Solutions, contains much more advanced topics.

Analysis Server 2005 Books

The first book is a beginner reference and guide to Analysis Services. The second, Applied Microsoft Analysis Services 2005 provides a more BI focused approach that integrates reporting and analytics. The final book is probably the best as it is very detailed and provides guidance in relation to the Kimball method to creating data warehouses.

Project REAL

Project REAL is a best practices implementation for creating BI applications based on SQL Server 2005.

Webcasts and Online Learning

Kimball Webcasts on Data Warehousing and Business Intelligence
Course 2942: New Features of Microsoft® SQL Server™ 2005 Analysis Services
Course 2943: Updating Your Data ETL Skills to Microsoft® SQL Server™ 2005 Integration Services
Course 2944: Updating Your Reporting Skills to Microsoft® SQL Server™ 2005 Reporting Services

Web Sites and Forums

Analysis Services Homepage
Microsoft Business Intelligence Homepage
Business Intelligence Developer Center at MSDN
Analysis Services MSDN Forum
Reporting Services MSDN Forum