The fact that you can't do this without a utility in a bug, right?

There's a preference under "Mouse" that says "Move content in the direction of finger movement when scrolling or navigating" (checked = inverted scroll) and one under "Trackpad" that says "Scroll direction: natural - Content tracks finger movement" (again, checked = inverted scroll). I should be able to use these two options independently to choose to invert the trackpad and not the mouse wheel or vice versa. Although, checking either option will automatically check the other option when you close System Preferences. Anyone else experiencing this bug?

Yes, but upon checking the checkbox of the trackpad, you can uncheck the mouse again and then it will stick.
(one of the many Lion bugs... ;) ).

I've found that it only sticks until I close System Preferences. I hope 10.7.1 isn't too far off.