Check out the 'Testimonials' section at pathoutlines re: employers and number of responses:
http://www.pathologyoutlines.com/Testimonialsjob.html
Some of my favorites:
"I believe we have already received half a dozen inquiries, and the posting has only been live for 12 hours." Dr. V, 26 May 2011, Michigan
"We received our 1st inquiry 10 minutes after you sent this message. So I think it is working!"
"We received many CVs by using Pathology Outlines. Actually within several minutes of the ad being posted, I had received multiple responses."
"We have received enough candidates for 5 hospitals" Ms. K, 24 March 2011, Ohio
"We had well over a hundred responses..." Dr. A, 17 March 2011, by email
"Your site has overwhelmed us with applicants and we feel that we can definitely fill the position with what we have collected to date." Ms. S, 27 January 2011, by email
Please take down our most recent ad [after 14 days]. We have more than enough applications. Dr. M, Tennessee, 1 June 2010
We have had over 90 responses! The president says half of them are viable candidates. Ms. S, Washington, 21 August 2009
Oh...wait. The CAP says the job market is great so these people must be exaggerating