Based on the process list in ATK, it appears that Blur home (including the widgets) are loaded and running - and can't be turned off in any way - when you are using Launcher Pro as your home replacement.
Is this an accurate observation?
Is there a way to stop any of the Blur widget processes from starting (rooted but standard ROM) completely? Just to clarify, "replace with Blur-less ROM" is not a satisfactory answer, since Cyanogen doesn't run on DroidX due to locked bootloader.