Thanks for the pointers. I definitely use Fear Ward, but I've been having each priest cast it on themselves, which, as you point out, is not as useful as having it on my main at all times. I'll also come up with some kind of dispel hotkey/macro for when my clones eat the fear bombs... just have to be quick on the dispel, but I guess that's true for anything in multiboxing.

The instant cast Smite talent, Surge of Light, is still in the Holy Tree and I've spec'd it on all my toons. It may not be a huge dps boost, but it's a lot of fun and with 3 priests it procs just about every other cast. Plus, for Holy Nova you can get a proc (or multiple procs) on just about every cast, depending on how many targets you're hitting. I've gotten in the habit of hitting three hotkeys in sequence whenever I'm AEing now - Holy Nova, Smite, Stopcast. This allows me to take advantage of a quick, free Smite should any of them have critted on the previous Holy Nova.