This excerpt taken from the NDAQ 10-K filed Feb 27, 2009.
Other Market Services Revenues
Other Market Services revenues increased in 2008 compared with 2007 and decreased in 2007 compared with 2006. The increase in 2008 was primarily due to the inclusion of OMX revenues of $27.7 million. The decrease in 2007 compared with 2006 was primarily due to a decrease in revenues earned from our testing facility, which charges a fee for customers testing new services, due to our migration to a single trading platform.