Xtrato, if you base your designing skill to the good usage on IE or Opera, you forget 75% of the internet market...

Work with Firefox even if you don't like it, because the internet is not coded based on your taste but on the entire community compliances... IE and Opera are not even compliant with the basic W3C rules...

anyway, my review:

the basic elements of your style is clean and crisp, the green over the silver is good, not too proeminent. maybe the dotted bars is not the best, i would have made id shaded instead of fully dotted. what bug me is the load of completely useless icons everywhere... the flash, photoshop icons just before your phone number, not good... also, showing your phone number directly on top of your site shows a lack of professionalism... contacts always have to be via a private form when you really are a internet worker... everybody knows it... because now, your phone number is listed for phone spam.

using unrelated icons is not pro... you have a distorted xBox icon for about everything on your site... relating your design to microsoft will not give you anymore power.

in the footer, there are spaces related to IE css coding that would be avoided if you follow CSS2 compliance... (use Firefox to see the errors)

if you really are a designer, design your posticons, your forumbit icons and all your function icons instead of taking 3rd party related icons anybody can find on themesbase.com