I just got the Oracle OLAP Newsletter for January 2010 and we got a nice write-up on Simba's MDX solution for Oracle OLAP 11g.  The University of Applied Sciences in Wildau, Germany has a Masters course in Data Warehousing.  They use Oracle OLAP in this course and the students used Simba's MDX Provider for Oracle OLAP in their course work. They were able to connect from Excel spreadsheets to their OLAP cubes.  You can read more about it on the Oracle website: http://www.oracle.com/technology/products/bi/olap/olapref/newsletter/oracleolapnewsletter_jan10.html.