Useful Links

Here are the links that I found useful:

MSDN Forum:
http://forums.microsoft.com/msdn/default.aspx?SiteID=1

MDX:
MDX Function Reference (MDX)
http://msdn.microsoft.com/en-us/library/ms145970.aspx
MDX Cheatsheet
http://gumper.com/mdx.html
Format_String
http://msdn.microsoft.com/en-us/library/ms146084.aspx

Expressions:
Expression Functions (SQL Server 2008)
http://msdn.microsoft.com/en-us/library/cc281391.aspx
VB Script
http://msdn.microsoft.com/en-us/library/3ca8tfek(VS.85).aspx
VB Functions:
http://msdn.microsoft.com/en-us/library/32s6akha.aspx

T-SQL Referrence
http://msdn.microsoft.com/en-us/library/bb510741.aspx

SQL Server Analysis Services 2005/2008 Articles
http://www.ssas-info.com/analysis-services-articles

TFS Data Warehouse
http://msdn.microsoft.com/en-us/library/ms244674.aspx#DataStops