Angel, very nice skin. I like your menu design. How are the logo pix swapped, is this just CSS?
The folowing are just my opinion.
I found it hard to read some of the text on certain backgrounds. Examples are "register, login text" on silver, red, blue are not as visible as on green. Also, the white text on Yellow is more difficult to read. I would also change the default DNN icons for help, and require so they match your clean lines and color scheme.
Good job..