The design is good. Let's start out with that :up:
I don't like the big image you're using, especially because it contains a link (the most important link of all => contact). The link isn't clickable; I guess you could add a hotspot to it but I think you should just code the top part of your site completely. With some clever measuring you could divide it into three columns so you don't have to cut up any images. Staying within the header, you should switch around your content; put your logo on the top left and the quote on the right.
Moving down. The separators are too hard on the eyes and maybe even unneccesary. The navigation needs more attention, it wasn't very obvious to me that it was the navigation because it had your validator links in it (so I assumed it was the footer).
Moving on to the next page. I like how the main image switches but I was slightly annoyed by the fact that the content seemed to be near identical. Again with three columns at the bottom, with the same title and almost the same content. And where did your CSS validator go? Did it fail the validation for that specific page or something?
The next two pages (portfolio and templates) are nice but here it is very obvious that those separators were a bad idea because you are now using only using part of your website. I like the idea of switching the preview images, but it would be much better if you would give a short description of that project in the header. So you really could use some good HTML for the top part of your site.
The last two pages seem to have some problems with the padding for the content. And also I see the same three columns at the bottom for those two pages. Why not implement those two pages into one page?
I hope this was some constructive criticism, welcome to DF, don't leave
