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This is beautiful and impressive.
Couple Things that could make it even more great.
Love the logo in the beginning it is stunning but once you leave that home page to the other sections it doesn't appear again. So when you're on the service page you are thinking what is this company called again. I would keep your logo on every page.
The text under the portfolio title seems to be not needed and placed weird because of how short it is. I would either add more to the text or remove it.
You can add some more functionality by using SWFAddress to have the url change between sections making the back button work and deep linking which is always nice.
Only other comment I have is maybe to add a highlight or rollover on the home and language button. I understood the home button pretty well but didn't know that language button changed the language until I clicked it.
Also some rollovers on the service page would be great as well.
Beautiful Site!!

Thank you, Elaine, that's a bunch of valuable suggestions!