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how about a state indication on the navigation? this might help orient people who are maybe less savvy and potentially confused by the design/theme changes per page/section.
also, is that brushed image on the homepage clickable? is it a particular portfolio piece? i suspect it's an engaging image (though not particularly to me, but i love the brushed treatment), but i don't see that it relates to any of your existing work?
also, i'd throw in my vote for:
bumping the vertical blue badge at top to just outside left grid, making the logo (you're name) line up with left edge.
as far as the buttons or text links on network page - i'd say, loose them both, and make the entire region clickable with a nice subtle (or not so subtle :) hover state on the whole area (name, image, role, whole rectangle). also, maybe there's a way to make three columns work? seems silly to have multiple pages.
this is excellent work!

Thanks for your review, very complete.
Actually, the image on the first page is a piece of my portfolio. It's a poster for a concert. And i was thinking of changing it sometimes, when i have something i like. But only quite personal work. ( not corporate )
For the blue badge i tried to do like you said ( and like other said ) but i'm not sure but i'm quite
embarrassed by the fact it goes out of my grid... i don't know..
Network page : For the moment i only chose those contacts for network. I will think about a three column design when i will have more i think.
Thanks again for your time and advices. :)