Just in case anyone missed it, the 2011 Global Knowledge/TechRepublic annual salary survey can be found at the url below. In addition to strictly technical certification, there are some numbers for Six Sigma, Audit and Project Management. There is a reference to CCIE Routing and Switching, but no information for any of the other CCIE disciplines. There were only 37 respondents for CCIE R&S. Since R&S makes up roughly two thirds of the CCIE (based on the last published statistics), they may not have had enough respondents to show CCIE Voice, Wireless, Security, and Service Provider. The minimum number of respondents that are show in this particular report for any category is 25.