Yes, there are a couple of great studies that were done by Deloitte for the Investment Company Institute, here is a link to the most recent study, http://www.ici.org/pdf/rpt_11_dc_401k_fee_study.pdf The "all-in" fees are sliced and diced any number of ways. This is very useful. If you are a plan participant you should be getting information about your fees in the next several months due to new DOL Regulations. It may be useful to visit the DOL Pension website at, http://www.dol.gov/dol/topic/retirement/consumerinfpension.htm . They have several documents that can help you understand the fees you pay, as well as what you should expect from the fiduciaries that manage your plan
Brightscope and Judy Diamond are two that I know of. To what end are you performing this analysis?