Interesting article saying that Sybase IQ revenues were up 70% in 2007, and formed a very significant part of overall revenues:

http://news.yahoo.com/s/cmp/20080301/tc_cmp/206901052

Also mentions Mike Stonebraker with his column-based database start-up, Vertica, and how one of the senior IBM technologists puts forward that the full benefits at the back-end of higher performance are often not seen by the end user, and so the complexity involved in proprietary solutions outweighs the benefit. Element of truth in both, a standards-based approach is prefered by most institutions, but I think financial markets are a special case where back-end performance is transparent to the user.