I think you've got the amount of white space about right. It probably need a bit
more padding in places - in the News box and on the RHS of the main text. The margin between the side boxes and the main text is a little wide, though.
The text on the top nav links should be bigger, probably bold too. I don't think they stand out well in black - try yellow or light grey, or make the bg paler and use a dark blue-grey. I'd lose the underline too, maybe putting it in on hover, folk are going to realise that they're links.
The side navigation needs bigger, bolder links too. Again the black doesn't really work - a dark blue-grey instead perhaps?
Consider using a blue in the top/side bars that is closer to the colour of the sky in the photo. It might end up lacking in contrast though.
Edit the photograph to paint out the bird(?) to the left of the windmills - it just looks like a speck of dirt (which maybe it is).
Lose the big 'Please note that the term "web site" has been used here instead of "website".' paragraph at the bottom. Which of your visitors is going to care?
Use the same font in the "latest news" box as you use elsewhere in the page. It looks like you've forgotten to change the font in that box - whether or not that's actually the case.
I'd be wary about having a "latest news" box anyway, unless you're sure you're going to have plenty of news to put into it. A "latest news" are that's dated umpteen months ago just screams "Dead Site!" (not that you have this problem at the moment). Design your page such that the news box could be missed out altogether when there's nothing to report.
I didn't look at many of the other pages. The copy does, indeed, need work. Triple-check the spelling ("catagory" = category) and the grammar ("Latest 5 Entry's" = Latest 5 Entries). The whole text is a little stilted and has a slightly keyword-overstuffed feel about it. Sometimes reading it aloud will help you smooth out some of the rough edges.
Maybe a couple of images will help balance out all that text. More windmilly, airy photos, or the standard happy/intense people in suits stuff. Both could work.
Use the same blue for the "News | Site Map | Directory | Contact Us" links at the bottom as you use elsewhere on the page.
-- Chris Hunt
Webmaster & Tragedian
Extra Connections Ltd