looks pretty good, still, I think that the black background makes it hard on the eyes, you could use a brighter color.
I suggest you keep the tag cloud below the URL submit box. Other than that, everything looks good. I pretty like the adsense placement, good job!
I like the black background because it looks nicer then a white one but you need a diffrent secondary color other wise,nice site! Keep it up.
I would also suggest putting the tag cloud below the submit box. Change the color combination, change the background color to a brighter one good luck!
I like the other idea's in here also good adsense placement, URL Bar is little harder to find at first glance but not bad!