And that information is available on a W2 form starting last year is it not? I seem to remember the employer contribution being mentioned before.
ETA: Why yes, yes it will for further information see:
http://www.irs.gov/uac/Form-W-2-Reporting-of-Employer-Sponsored-Health-Coverage
Those friendly folk at the IRS. Yes, those same wonderful folk who often offer botched tax preparation information and say "sorry, we goofed."
Yes, last year employers were required to put the cost of COBRA eligible plans, the full cost as a line item on your W2. This includes any plan the company paid a portion or all of, such as medical, dental, and EAP. Of course, it was specifically for informational purposes.

In all of the research I have been able to attain, I can get premium info for these plans, but now plan design- deductibles, copays, etc...NONE!