[Brian]

I wouldn't say it's "normal", but I know I've seen stuff like this happen on my iPhone, both in OmniFocus and in other applications.

I'm not technical enough to give you an absolute answer as to why that happens. I'm sure there are places where our code could be more efficient, but it's also possible that the iPod/Phone apps are doing something in the background, or that the OS is using processor time to shuffle stuff around on the flash chips in the background.

If you come across particular sets of circumstances where OmniFocus gets hung up, sending in information to the support ninjas will help us find and fix the places where we're at fault. :-)