How concentrated is your portfolio? (How much is in your largest/Smallest positions?)

Recently there was a thread asking how many positions we held, which is one measure of portfolio concentration. However, this is analogous to an average whereas a measure of dispersion would also be significant. For instance, I currently hold 9 companies, so my average position size is ~11% (regardless of actual weighting). This could be more or less top-heavy, and that is what I am interested in learning.

How concentrated are you in your largest few holdings? What is the smallest position you will abide? What percentage of your portfolio is represented by your biggest/average/smallest holding?

Since I have a concentrated portfolio, I'll give you a full breakdown:

20.0%
16.3
15.1
13.5
12.5
 8.0
 5.2
 4.4
 1.8
 3.2 (Dividend due tomorrow)

If you hold exactly 9 stocks, how do my weights compare to yours? Why do you maintain the specific level of concentration (or diversification) that you do?