With our CSR's continually using our websites to take orders, we continually get feedback on what is and what isn't working. If something changes that we weren't anticipating, we usually know within a matter of hours, if not minutes. When USPS changed their site and we stopped getting rates, it didn't take long before I was being asked why we weren't offering that option any more.
Quality assurance is a great thing. By having many computers of known setups hitting our site, we can make sure our site is working in all common browsers easy enough. We know that it's continually being tested in IE and FireFox, so I don't have to worry about having one of those "Oops" moments when some oddball error shows up in a …