Very nice, Shim! By adding the ", .tags, .categories" to share the same properties of "#searchform, #subnav", ect., I see you're coding efficiently. Nicely done.
One small thing, though. I see you have this in your CSS
#content cocde {
background:#F5F5F5;
display:block;
margin:0 0 15px;
padding:10px 20px 0 15px;
}
I don't know what you're trying to do but that currently is doing nothing to your layout. Why? because you have "cocde" as a selector. I search the markup and couldn't find a Class nor ID with such name so, unless you meant to do something else, I would recommend removing it since, like I said, it's doing nothing to your layout.
Now, personally, I think the gap looks just right, but here's the code to make it smaller:
.post-meta {margin-bottom: -20px;}
20px is a suggested value, you'll need to play with it till you find one that you like best.