Well, we’re back up and running. I can’t say that all the holes have been plugged, but they will be as they come to light.
The articles listed in the Reference section have provided a wealth of information on how to make WordPress more secure. You can bet that I have implemented most if not all of these suggestions, plus a few more not listed. While it’s not guaranteed the site 100% hack-proof, maybe we can get three 9s from these changes (i.e. 99.999%). We’ll see.