i like it...really like the colours and simplicity
but:
- when the page gets bigger that bkground-left_11.4 has to go all the way down, till the end of the page
- the portfolio links should open the pages in a different window, this way your visitors never loose your page
- weblog font should be arial or smth but times new roman
- the menu - when you select blog it should became orange, now you select blog and concepts becomes active
- in the title i think it should be first the name of the company and then the page. Ex: Cubeshark Web Studio :: Contact
...and that's about all. Correct these and i'll love your site