reason: novel buttons, particularly the indented ones.

source: http://www.facecjf.com/web-ui-kit/

reason: I laughed aloud at the unsupported form submission. there should be an acronym to indicate such laughter.

another reason: suave.

source: http://www.mikaeleidenberg.se/page...

reason: smooth and comfortable.

source: http://www.sebastiengabriel.com/blog...

reason: minimal design and the camera parts converge as you scroll down the page.

source: http://nizoapp.com

reason: good use of space and light colors.

source: http://www.allisonnold.com

reason: consistent and rethought elements with a dark touch.

source: http://365psd.com/day/2-63/

reason: textures, colors, menu, and inviting presence.

source: http://dribbble.com/shots...

reason: textures, colors, and relative simplicity.

source: http://www.petergranfors.com