Interface Design

Mockups

•  http://sucs.org/~dez/sucssite/
•  http://sucs.org/~chckens/sucsmockup1.png
•  http://sucs.org/~frosty/sucssite1.png

Kind of cool designs

•  http://www.deviantart.com/view/33943638/
•  http://www.45royale.com/
•  http://www.ambitiouslemon.com/
•  http://www.ubuntu.com/

Techniques

•  http://www.456bereastreet.com/archive/200505/transparent_custom_corners_and_borders/
•  http://e-lusion.com/design/menu/

Possibly useful libraries

•  Overlib