To be completed - suggestions of helpful URLs welcome
SSAS cubes and MDX
www.ssas-info.com
Technet
SSAS data mining and DMX
www.sqlserverdatamining.com
you can download your free Data Mining Add-in for Excel from here (32-bit only)
Technet
MarkTab.net
PowerPivot and DAX
www.powerpivot-info.com
www.powerpivot.com
you can download your free PowerPivot for Excel from here (32-bit or 64-bit)
PerformancePoint
blogs.msdn.com/b/performancepoint