Here's some shots of the Formula Wizard - it's turning out quite well, actually.
Valid Formula:
Invalid Formula (with explanation of error):
I'm just about done with the formula wizard. After that, I need to debug the column sorting and reordering in the facility list (it works MOST of the time, but sometimes not, so I need to find out why and fix it) and then package it all up with an installer.
Once I release the initial version, I'll start on the component editor.