S51

Here it is http://surface51.com/ Surface 51. Clean centered splash page with nice motion banner. Thumbnail gallery on portfolio page is well organized and interactive due to the hover effect of different categories.

rockstar

http://rockstarworking.com/
Ok, this site isn't perfect, the design categories should be links in my opinion. BUT I really like the slideshow system and the hovers he has for his actual work. His designs are pretty good as well.

Matthias

Prepare to be wowed. Very interactive, fun, easy to navigate conceptual site. ClicK here--> Site

colagene

http://www.colagene.com/en/
Easy to navigate, organized and consistent grid simple and straight forward.

SpinX

Spinx Wesite
Professional, contemporary layout with (a bunch of) excellent examples.

phenomblue

http://www.phenomblue.com/
A nice design firm portfolio, the website makes me think they are heavy on the social media.

Emmek

http://emek.net/index.php
This is Emmek's portfolio/online shop. He has work that just blows me away from the motion graphics to the illustration. Easy to navigate... and you should its worth it.