Business Intelligence and OLAP/MDX

What are good (no vendor related) blogs about Business开发者_如何学编程 Intelligence and OLAP/MDX ?

Edited: To widen a bit the scope and after the answer of Boyan: blogs/forums related to information visualization and Business Intelligence ?

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In addition to the rest of the links in Skarab's comment:

I don't think you will find technical (i.e. MDX/OLAP) blogs which are not vendor-specific. Maybe one site that stands out imho is Kimball's http://www.kimballgroup.com/. The articles and the discussions are often vendor-agnostic and you can get some really good knowledge, too.

Otherwise, for "soft"-er topics, you can read Stephen Few's blog on information visualisation.

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You can check Metatron Discovery and its documentation about OLAP & 4th generation BI related to their solution.

Also, it's a bit vendor specific but they kind of well organized the idea of OLAP engine. Cause they use Druid for their underlying processing engine.