Throwing in my 2 cents, I'd say the title "Crown of the Kobold King" should be more prominent than it is. As is, the Gamemastery Module portion greatly overshadows it, and kind of makes it seem like a tutorial rather than an adventure.
Otherwise, I like it quite a bit. The picture makes me think of Prince Kol XIV of Mystara (minus the axe, that is). Who's the artist?
[EDIT- the idea to post the levels is good, too, although that could certainly be done in the text on the back of the module, too. I would presume that anyone interested would look at both the cover and the back. On the cover has the advantage of immediately drawing the attention to it for those curious, but on the back would mean that you might be more likely to have someone do more than just raise an eyebrow and actually look.
Although, now that I think of it- is this something that is only available as a .pdf? Or will there be hard copies available as well?