Looks great Serkan but there's a few small points I'd make:
- The negative letter-spacing on headings makes them hard to read (well if I could read Turkish anyway )
- I find it a bit odd that most of the text is in Turkish except for the slogan/tagline in the header.
- The link to İletişime from the body copy on this page - http://www.sercotec.net/index.php/web-tasarim-hizmet - is missing index.php.
- The white highlighted main nav links are a bit hard to read against the clouds background-image.
And no, haven't seen Lorraine around here for quite a while.