Almost perfect
Just make the "Recent Posts" and "Recent Comments" items a little less high, it should be around 25px. Also add some small padding to the left (like 3px or so) because the li square is too close to the ledge.
And for some finishing touches and a little bit of CSS3 you can add a slight gradient to "Recent Posts" and "Recent Comments" title backgrounds. Instead of using simple dark blue color use this:
Code:
-webkit-gradient(linear, 0% 0%, 0% 100%, from(#195F91), to(#1D435E));
Tip: If you are not familiar with new CSS3 fancy effects try
this online useful tool
After all you may want to add some more CSS3 stuff. That's all up to you.