Nicely designed there! Some constructive feed back will be listed below.
First main primarily thing of all, its pretty graphic heavy... Some images could be cut in stead of over layered. Like in this image you use,
http://www.knrdesigns.com/images/png/bg_effects.png Its nicely done but its a pretty large image. And even some of it gets over layered. For example the 2 soft brushes on the bottom. All you see is a tiny bit of the shade. How would i recommend fixing this? Maybe cutting the image to
look like it is under layered but its just the image sliced so nicely. If one of you guys are good with Photoshop which it looks like. This should not be a difficult task.
But in general view, you did a good job. Kept a nice color scheme, nice rounded corner's to simulate web 2.0 and centered just makes it nicer.