A Roman-numeral list. Try it at any font size or face. All numerals should remain right-aligned, all lists elements left-aligned.
This is a Kindle3-specific effort. It is not intended as a universal Mobi solution because the diverse Mobi readers render formatting so differently from device to device.

I. This is the first list element.

II. This is the second list element. This one is very long to cause line wrap. Lorem ipsum, lorem ipsum, lorem ipsum, lorem ipsum!

This second element has a second paragraph, of which the first line is indented. Lorem ipsum!

III. This is the third list element.

a. This is the third list element's first subpoint.

b. This is the third list element's second subpoint.

i. This is the nitty gritty stuff! a third level.

ii. More nitty gritty. Who reads it? Same people who read the fine print on contracts.

This is a second paragraph of the nitty gritty, with a first-line indent.

c. I've had enough of this now.

The above multi-level list should format well at any font size or face. All numerals should remain right-aligned, all lists elements left-aligned.