I've received a total of 3 responses

1 - went through a lengthy interview process (3 hour interview). They canceled the job and decided not to hire anyone

2 - Passed up but received a nice, boilerplate email

3 - Canceled the job posting

So far, my response rate is about 1 for 11 which isn't too terrible in this job climate. It just annoys me that I go and apply for a job to have the job canceled. If you're going to hire for something, be sure you're going to fill the position and quit wasting my, and the hiring manager's, time.