We've used Overnight Prints for our largest advertising client for direct mail postcard campaigns -- large production runs; very little turnaround time -- and they've never missed. I agree about WHCC for most of my photographic clients but sometimes you have to maximize your client's budget as well.

I've used Shutterfly and Zazzle for card orders and have been very happy with the quality of what I've received. And Zazzle is the only place I've found that does big calendars like last year's Sundance calendar.

You have to try them all for yourself and then use the ones that you really trust for your clients. That's part of the vendor process: select who does what best and keep testing them to make sure they maintain quality control.

Jim