Gartner have produced some interesting research on the Business Intelligence market for 2008.
This is particularly interesting as a number of the larger BI pure play vendors such as Business Objects and Cognos have been purchased by some larger software vendors – notably SAP and IBM. Some of the small BI pure plays have also been snapped up – Microsoft’s purchase of ProClarity and Tibco’s purchase of Spotfire.
There is also a useful section at the bottom which lists the strengths and weaknesses of a number of the vendors which makes for some interesting reading. Have a read of the research article.