Aberdeen is currently conducting a large research project - which always starts with a survey - on how corporatations are leveraging web 2.0 and social business software solutions around the employee engagement use-case. You can obtain a free copy of the report by completing their survey here - http://www.aberdeen.com/survey/wtm09jiv.
I believe the report itself will come out in June. Also, in full disclosure, Jive IS NOT financially sponsoring this report in anyway. I just thought it might be something that Clearstep members may be interested in.