Just a casual comment before this one catches fire...
I'm using RPG Mod to help me develop commercial projects, I haven't scratched the features it offers, but the inventory, variable, write to disk and lots of other features offer a wealth of scope to the creative developer.
The support is also fantastic.
A for a
Quote: "'waste of disk space'"
;well, I imagine that is a possible view, but not really one I'd worry about subscribing to as my view is the reverse.
Bottom line; want and Invetory? RPG Mod has a great system that is rock solid, free and works.