IPA global survey of top companies shows more must be done to promote the value of marketing in the push for resources in addressing corporate needs.
This is a study published on 12 August 2009 coming out of the IPA.
Read the article at:
"Top companies show more must be done to promote value of marketing"

Also found on the IPA site a report that analyzes the investment in share of voice to grow share of market. It discusses a measurement method for rough calculation for investment to return. Interesting. Does it really work? Don’t know, but it may be worth testing with some of your work with clients. 
Click here:
"How share of voice wins market share"